Seller GoodGameMedia is selling signed 360 merchandise on behalf of Childs Play Charity, a global charity dedicated to improving the lives of children in over 60 hospitals worldwide.
Items on auction include:
Mass Effect 2Â signed by Bioware staff
Halo 3 controller signed by Bungie staff
Fear 2 faceplate signed by Warner Bros / Monolith Staff
All can be found here (link should work this time :P)