There was a flier with three double coupons in Sunday's paper! You'll likely be able to pick up extras in-store too. My experience has been that they'll let you do 3 back-to-back doubles transactions without too much hassle. Then they at LEAST want you leave the store!
Here's a link to some good doubles scenarios right now at Frugal Living NW. I'll post others later after I hit the store!