Frugality Is Free is hosting a Gift Card Giveaway Linky. You can add your gift card giveaways to the linky to help get more exposure for your giveaway. Or you can go there to find giveaways to enter. She also has a linky for giveaways in general. There is even one for books!
I like the way she does these too. She asks that you add the end date of the giveaway. She removes outdated ones as they end. So newer ones are always moving up the list. So go over there and add your giveaways or enter a few!