What are your prices?

We have flexible pricing determined by volume and how much of the process is performed by the seller through different service levels. Details of our Online Arbitrage Prep service levels and pricing for each one are found at https://prepninjas.com/oa-services/.

What are your procedures from A to Z?

We offer premium prep services for a wide range of needs. Details of our Online Arbitrage Prep service inclusions and pricing are found at https://prepninjas.com/oa-services/.

What does tax-free mean?
When you purchase online and ship to our center in Oregon, you don’t have to pay sales tax like you would in most other states. The money you save on sales tax helps to offset the cost of outsourcing your inventory prep. That means you can grow your business even faster. For example, the average sales tax rate is around 8%, which means you’d be paying $1.60 in tax for a $20 item. 
Do you prep and list used books?

We focus on new merchandise and recommend using a prep center that specializes in used books. However we can work with a small number of used books in conjunction with your new merchandise as well. Additional fees may be incurred depending on volume and resources required to prep the used books.

What is the turn around time for prepping?

Processing time can vary, but typically we will process a shipment within 24-72 hours from when we have enough units for a shipment. In order to minimize your shipping costs, we recommend having around 30-50 units per shipment, depending on the sizes of the products. Processing can take much longer during high-volume months like May/June (in preparation for Prime Day), after major sales, and Q4.

Do you work with new Amazon sellers?

Yes. We work with new sellers, but you must have a good understanding of Amazon’s processes and requirements. There is a lot to learn before selling on Amazon. We highly recommend at least going through Amazon’s free Seller University training available at sellercentral.amazon.com/learn before getting started. It’s rewarding when done right so don’t give up!

Do you work with International Sellers?

Yes, especially if you are purchasing goods in the US and shipping them to our center. We accept international shipments sent to us. We do not broker or process the paperwork involved for importing/exporting goods at this time. We only accept payment in US Dollars.

Do you accept and ship pallets?

Yes. We do accept and ship pallets as of May 2019. However a liftgate on the truck is required.

Do you have minimums?

Our pricing options are based on your monthly volume. You choose the level that best fits your volume so you can lock into the rate at the time you sign up. If you’d like to change your pricing option, you must re-enroll in the service plan and sign a new agreement. You can cancel or change plans at any time. All our costs will be deducted from your prepayment until exhausted. You will then receive invoices for additional shipments until the next month if appicable. 

What kinds of "hazmat" items do you accept? Cosmetics and batteries too?

Products that are or contain batteries such as toys or power tools are accepted, though we do not accept products with lithium-ion batteries for long term storage. Cosmetics that are classified as hazmat are accepted as well. Products that require specialized storage and equipment such as fuels, solvents or corrosives are NOT accepted at this time. Products should withstand Amazon’s temperature sensitive requirements as well. 

How are the fees for shipping to Amazon calculated and paid?

The shipping labels and charges for your Amazon bound shipments will go through your Seller Central account. We recommend using Amazon’s Partnered Carriers to save on shipping costs, which is UPS. You pay those shipping costs through your Amazon account. For hazmat shipments, or any other shipments that go outside of the partnered carrier, we will invoice you for the incurred shipping costs.

Will you share information about my buys?
No. We have a strict confidentiality policy and will not disclose information about you or your buys. We are not Amazon sellers, so you will never have to worry about us trying to compete with you either.
How will I be billed for your services?

At the beginning of each month, we’ll send you an invoice for your monthly down payment, if your plan requires one. The down payment locks in your rate for prep fees. That payment will be applied to your prep fees for the month. Once the cost for your prep fees exceeds the pre-paid amount, we’ll send you an email invoice as soon as your order has shipped to Amazon. You’ll be able to pay by credit card or ACH. The payment is due at the time you receive the invoice.

If your plan does not have a monthly minimum, we will send you an invoice for each shipment via email.

Do you require User Permissions?

For our premium prep service, we require at least “employee” level permission on your InventoryLab and Seller Central accounts. InventoryLab is required for Premium accounts. Different services such as AccellerList are accepted. There would be a learning period as were are only familiar with InventoryLab. 

For InventoryLab, you can share “listing access” in InventoryLab by simply adding a sub-account with list-only privileges. This allows us to create new shipment batches, label items quickly, and upload shipments and box content information to Seller Central.

To begin, create an email account (for example, with Gmail) that can be used exclusively for sub-account access to InventoryLab.

Next, create an InventoryLab sub-account by following this guide: https://www.manula.com/manuals/inventorylab/inventorylab-user-guide/1/en/topic/sub-accounts. Use the email account you created in the prior step for this account.

Add us an an InventoryLab employee: https://app.inventorylab.com/account/employee. Check the box “List” under Inventory Lab (top-right of screen) > My Account > Employees > Edit. Then add our center to your Ship From address: Inventory Lab (top-right of screen) > Settings > Shipping Information > “+ Add” button.

For Seller Central, you’ll need to give us access to shipping plans by granting us Seller Central sub-account access.

1. In Seller Central, click “Settings” (found at top-right of the screen) then “User Permissions” in the drop down menu.
2. Under “Add a New Seller Central User“, add our sub-account email and click “Send invitation“.
3. We will accept the invitation in our email and notify you when that is done.
4. Afterwards, you will be able to select the level of permission granted. In Seller Central go to “Settings” in the top right corner then “User Permissions” in the drop down menu. Click on the “Edit Permissions” button by our Prep Ninjas email. Select the radio buttons below “View & Edit” for “Manage FBA Inventory/Shipments” and “Manage Inventory/Add a Product”. Then click Continue at the bottom of the page. It should be all set.

Do you offer storage if I need to hold a shipment?

Yes. For Online Arbitrage, we don’t charge storage fees if we are processing your order. If the product cannot be processed or you’ve asked us to hold it for any reason, we charge $.42 per cubic foot per month or $22.72 per pallet per month. Wholesale, private label, and FBA Removals may have different storage rates. Check your plan for specifics.

Do you take oversized items?

Yes, for an additional fee.

Are my products secure?

Yes. Our warehouse is a secure facility and your items are stored with care. We are also insured. 

What kind of fire protection do you have?

We have alarms, extinguishers, and insurance. We do not store combustible fuels, solvents, or lithium-ion batteries.

How do you minimize outbound shipping costs? For instance, using private workflow instead of live.
We try to minimize shipping costs when possible without breaking Amazon’s rules or risking damage to anything in transit. We’ve only used private workflow in InventoryLab so far. We also do the extra steps to combine commingled and seller labeled shipments going to the same Amazon distribution center.
Did you discontinue your "Basic" and "Basic Plus" services?

For the foreseeable future, we have discontinued our Basic and Basic Plus services where the client lists their products for a deep discount.


Commingled units use the UPC instead of an Amazon barcode label. That risks mismatched or lost units and blame for someone else’s bad stock. O.A. products should use Amazon barcode labels while commingling is better for wholesales. Inventory Lab can’t send them both in the same shipment and we most likely won’t bypass the more efficient box contents in Inventory Lab to combine them.

Inventory Placement can save shipping costs?

Amazon’s Inventory Placement fee can save on shipping costs and our turnaround times. Especially when your whole shipment is less than 50 lbs and can safely fit within a large box. A batch split into 3 shipments costs more than 50 small products in placement fees. It’s not as effective with large products that will use more boxes anyway. Also splits are meant to get the product sold and to the customer faster. See more about splits on our blog.