here's some values

Xbox 360:
Carnival Games: Monkey See Monkey Do - $16 (7/31/11)
Dance Central - $20 (7/31/11)
Guitar Hero: Metallica - $6 (8/20/11)
The Incredible Hulk - $6 (8/20/11)

PS3:
Naughty Bear - $7 (8/20/11)
Transformers: Revenge of the Fallen - $6 (8/20/11)
TV Superstars - $4 (8/20/11)