Have you checked out this site Kitten. I've become too lazy these days to keep on top of coupons etc., but many years ago when I was living on a shoestring with 3 kids, they came in mighty handy.
[A href="vny!://save.ca/en/index.htm"]vny!://save.ca/en/index.htm[/A]
PLUS, our local grocery store used to have Triple Value Tuesdays......which meant they would give you triple the value of all your coupons. Some stuff you'd pay only pennies and some stuff nothing at all.