For about the price of a value meal, you can get a full boxed retail game. GameFly's Year-End Sale has just kicked off and there are some great deals for the Xbox 360, PS3, Wii, DS and PSP.
Samples (without GameFly discount):
Conan - $7.99
Haze - $9.99
Unreal Tournament III - $9.99
Harvey Birdman: Attorney at Law - $4.99
Wipeout Pulse - $12.99
Grand Theft Auto IV - $19.99