Get 20% off your entire purchase during Michaels friends and family sale May 13-15, 2010. The discount comes off the original ticketed price, so I'm guessing sale items that are already discounted by 20% or more are not going to be any cheaper. You can also get 60% off a custom framing order at Michaels.
Caveats: no rain checks. Selection and prices vary by store. Good only in the United States. The 60% off coupon is not valid on Brushstroke Portraits.
The above link also has a 20% off coupon for Aaron Brothers, plus a 60% off coupon for customer framing orders when you purchase a frame. The coupons are valid May 13-15, 2010.
Caveats: not valid on package orders, special orders, Time Frame orders or previous purchases. May not be combined with any other discount. One per customer. No rain checks.
Michaels and Aaron Brothers coupon for 20% off