Advance Auto Parts stores take $10 off a purchase of $50 or more via this printable coupon. That's the best dollar-off discount I've seen from this merchant, which sells many different car-related products. This coupon cannot be combined with any other offer. Deal ends March 30.

http://img.ed4.net/citizensbank/2008/121207_rewards_january/build/coupon_aap.html

http://img.ed4.net/citizensbank/2008/121207_rewards_january/build/images/coupon_aap_lr.gif