For a limited time, you can get a $5 off $5 coupon at GameStop by downloading Global Assault app (Android HERE, iTunes HERE). Once the game has downloaded, click the Red K icon in the top corner. Create an account and the GameStop coupon will be emailed to you within 24 hours. It look less than 30 minutes for mine to arrive.
With the $5 coupon, you should be able to find free or super cheap items at GameStop. They often have used games in the $5 range.