I used to be a re-seller but I never wiped the shelves clean, more like I bought a couple of singles to sell (so I could make enough money to buy a game I want).
Go for Ebay, you should make a decent profit, but...some titles won't sell.
I suggest you place starting price per game at the price you paid + expected ebay fees (so for 5 buck game like...maybe 5.75-5.99). You should at least break even. Lots are bad, you lose LOTS of money.