Don't bother with the $3 off coupons.
When you make some purchases, the store receipt includes a $ 3 coupon if you do the store survey. After going through the survey, I was left at a page where I can "like" them on facebook or twitter etc. No screen appeared with a coupon! My receipt had not expired (was within the 2 week period) and I went through the entire survey online.
The other issue is that there is rarely enough stock at the store to accommodate the sales for example chocolate bars. I am given rain checks that I usually forget to use, after buying what I needed else where.