This is probably the most helpful thread for info on private offers. People will give away their private offers but you should be able to get one yourself if you follow the advice in that thread. Middle of the month is when they seem to ramp up the private offers on the Chevy website. Private mode on either safari or chrome and clearing history and cache seems to help. Good luck!
http://www.camaro6.com/forums/showthread.php?t=436966