This deal is in-store only and requires coupon. List price is $19.99 Best Buy's @Gamer magazine includes a $15 off coupon. You must be a Gamer Zone Rewards member to get the magazine or you can purchase a single issue in-store for $5 (please don't steal the coupon out of the magazine). You do not need to be a Rewards member to use the coupon. The coupon cannot be used online.
I believe the coupon is good for Xbox 360 or PS3 but I did not see an online listing for PS3 (new), so they may be out of stock on PS3. There appears to be plenty of stock for Xbox 360.