Thanks! I got the 15%-off coupon in my email, but I instead successfully used this 20%-off coupon at a store to purchase a new backpack with a 100% rebate (as a Staples GC). The rebate form shows the backpack's price before the coupon, so it appears that I'll be getting a GC worth more than what I paid even after tax!

Starting tomorrow:
Peachtree Accounting Pro 2011 software FAR. (Must register software to get rebate.)
Any ream of paper FAR (in form of Staples Rewards).

Coupons:
In store: $10 off $50 purchase. Expires 8/7/10. Valid in AR, AZ, CO, NM, OK, SD, TN and UT stores only.
http://reg.e.staples.com/c/s/tagfrm/...pon.html?n=889

In store: 20% off Command hooks. Exp 8/31/10.
http://reg.e.staples.com/c/s/tagfrm/...pon.html?n=803