If you're subscribed to their emails, check your email. There's a 'get $20 giftcard' for any game $60 or more. or '$50 giftcard' for buying 2 $60 games. However, this is for the 8th only. If you and a friend/family are buying 2 copies of CoD, this could be a good place to buy them.
Couldn't care less about CoD, so not sure if I'll be using this.
Also, these gift cards require you to print the coupon, and bring it to the store with you. They have unique numbers.