I expect that later this weekend we will officially launch a new option to have your inventory listed on Amazon. In the meantime there are some things you can do to prepare for this.
Expectations
First off, I want to make sure your expectations are set appropriately. Listing single sports cards on Amazon is a relatively new endeavor. They are still working out some kinks and adding new features. Most of the public has not been trained to look for sports cards on Amazon. As a result, the exact same inventory will likely get significantly more sales on CheckOutMyCards.com than it will get on Amazon. I would roughly estimate that listing your inventory on Amazon might increase your sales by about 10%. That said, our couple week testing period only offers limited data. These numbers could sway greatly.
Fees
Because of our unique fee structure, our sellers commonly avoid our 20% cash-out fee by recycling earned store credit to buy other items on the site. In fact, they do it so frequently that we earn less than 8% cash-out fee per sale. This was intentional, it is encouraged, and it is a major factor in our growing success. However, it means that we don’t have high enough profit margins to cover the commission fees that Amazon charges. So… we will be passing along those fees to you if you choose to have your items listed on Amazon.
How it will work
To keep things simple, we are starting with one big option that will post everything you have for sale on Amazon. You will not be charged any fees to turn this option on or off. It will typically take a few hours for the data to initially go live on Amazon, but it might take longer at first because we can only post about 500,000 new listings per day. Once it is up there, your price changes should only be about an hour delayed. All new items that you list will automatically synchronize with Amazon.
Once we get an order from Amazon, we have a special CheckOutMyCards.com user account named “Amazon” that will make a 20% off offer that your account will automatically accept. You will be able to see these entries in your Offer History page. This is how we cover the Amazon commission fees and other monthly fees. We expect that many of you may want to inflate your prices before turning on the option to list your items on Amazon. That is perfectly acceptable. You will still be able to take normal offers on those items. The Auto-Accept Percentage, Minimum Offer Percentage, and Minimum Offer Amount settings only apply to normal offers.
Amazon Shipping
Just like on CheckOutMyCards.com, shipping fees are paid by the buyers, and they have a few options on Amazon. However, we charge a couple bucks more for shipping because Amazon requires that the orders be shipped out within 48 hours of being placed. In order for us to guarantee this, we run standard Amazon orders though our priority & express shipping pipeline. As a result we typically ship all Amazon orders placed by 6AM PST (9AM EST) on the the day they are placed. This is about 1-2 days faster than we typically ship our standard orders.
Back to testing…. More to come soon
Due to the snow storm in Seattle and because we were already shorthanded due to our move, we have to temporarily increase the packaging times required to get out Standard & Bulk orders. 
Posted by Tim Getsch 
For a long time I have admired how Amazon has changed the way people buy and sell goods. They have been a pioneer is so many ways. 
