"Like" Ace Hardware on Facebook to get a coupon for $5 off a $25 purchase. It's good 2/20/13 – 2/24/13.
Most of the time Lowe's or Home Depot will take these. It's been my experience that they will take them if you're buying something Ace carries. So, you can't buy a refrigerator with it. However, each store will vary. If you're making a special trip, you might want to call your local store.
(Thanks, Alicia's Deals!)