One time per person/email/household.

http://news.compusa.com/s...mpusa-winter-sony-sweeps/

Sweepstakes Prizes:

Grand Prize: A Windows Vista Media Center System with a 42-inch HDTV. (ARV: $1499.99)
1st Prizes (2): A Sony VAIO VGCLT32E All-In-One TV PC. (ARV: $1199.99)