STEAM

Used to buy PC games, any denomination desired, the more the better. Found in video games stores, and video game sections of most retailers. Sometimes they say DOTA2 but they are still good.

Xbox Gift Card

The kind with the dollar amount, not time amount. Used to buy some games via Xbox's download service. Usually with the Xbox stuff in major retailers.

amazon.com

General use cards for amazon, can pay for books, music, etc. Found at any retailer.

ebay

May not be available at stores, can be ordered through ebay.com. I actually really like these because it enables purchasing old games and dumb cartoon toys.

Dragon's Crown

For Playstation 3

Zone of Enders HD Collection

For Xbox 360

9 Hours, 9 Persons, 9 Doors

For Nintendo DS