Should I sell my baseball cards on Ebay or go to a sports card shop?

Selling them on Ebay will net you more than selling them at a card shop most of the time. Store owners have to make a profit and most of the time, they will sell a card on Ebay if they cannot sell it in their store. That means in order for them to make a profit, they have to pay you less than they would get for it on Ebay.