USE YOUR GAP, Banana Republic OR Old Navy CARD AND SPEND $100 ACROSS ANY OR ALL OF OUR WEBSITES IN A SINGLE TRANSACTION TO EARN $20 REWARD. Subject to credit approval. Offer valid online only from 8/27/12 at 12:01 ET - 8/29/12 at 11:59 PM ET in the U.S. at Gap.com, BananaRepublic.com,
I'm guessing this is on top of the regular 5 points per $1 spent at Gap brands, so that should make it $25 in rewards for $100 spent.
Also, BR has %30 off today w/code.
My math: $143 worth of merchandise + $25 in rewards for $100. Not too shabby.