In case you happen to be in St. Cloud or another town with a Coborn's...every Monday through the end of the year, Coborn's is doing double coupons for up to 10 coupons, up to $0.50 face value! That means if you have a $0.50 coupon, it will count as $1.00 off the item.
Rainbow Foods is the only other store I know of that does double coupons. Every Wednesday, up to 5 coupons, up to $1.00 in face value once you have spent $25 retail (not the sale price of an item). Sounds so confusing to me-but it would be worth figuring out if I were near a Rainbow on a regular basis, I'm sure it would mean plenty of free stuff!