2 articles about eBay inventory.
Selling on Multiple Platforms: Keep Your Records Straight
Listing on eBay plus a second site can speed up sales. It can also sell one item twice. Here is how to keep one clean record.
eBay Inventory Management: Track Costs and Completed Sales
eBay tells you what sold. It doesn't tell you what you paid, what's sitting unsold, or what you actually kept. Here's a simple system that does.