Just in time for back to school, a hot new Old Navy promotion! Earn $10 in Super C-A-S-H for every $20 you spend until 8/18 in –store only. Earn up to $50 of Super C-A-S-H per transaction. Then, redeem $10 of Super C-A-S-H for every $20 you spend from 8/25-8/29. In-store only.

More info here.