A friend just told me that Games for Windows is doing Age of Empires 3 for 10p. Although a PC game you can use 10 XBox live points to pay for it instead. Just login to the site with your live email and password.

http://www.gamesforwindows.com/en-GB...eofEmpiresIII/

Don't know if it's any good but must be worth a go for 10p!