Retro Toy Warehouse
Only imports ALL of your ebay listings one time - if you do it twice you'll have duplicate listings. I didn't know this, I imported all my items, then noticed some errors. So I went on ebay and made some changes, reimported thinking my updates would come over, NOPE. I ended up having duplicates of ALL my inventory. I just deleted and started over, but regardless - you need to individually edit or remove any inventory items that you either don't want listed, or have sold. If you re-import then you have to do all the edits over again. It's a nightmare and honestly not worth the effort. Easier to manually add items, unless you plan on importing 99% of your ebay inventory, and don't mind manually updating individual items that have sold.
Amazon import app is much better - automatically updates, and you can individually select items.