How to Sell baseball cards on eBay

Buy older and "failed" products on sale from wholesalers during the winter. In the Winter you can sell Football cards or its a good time to buy baseball cards.

Develop an inventory.

Do a little research. Baseball America is a good source. There are a few popular forums where it is easy to glean which cards are hot or not.

Sell during the baseball season when player are playing well and are in the news.