this site has links to lots of good printable coupons. I just printed off 2 $2 coupons for Kraft Live Active cheese. It sells at Wal-mart for $2.77. There is also a link there for a refund of the full purchase price for 2 packages.
There is also a link to get $2 coupons on Kashi snacks.
These links seem to all go through Coupons.com. My computer happily prints them and they scan just fine at Wal-mart.