Metro has these on sale for $3, so using the $2 coupon, they are just $1. Then, to make it sweeter, you get 50 airmiles (worth just over $5) when you buy 5. So buy 5, use 5 coupons, swipe your airmiles card, pay $5 and tax, then get your 50 airmiles worth $5 back!
If you do this multiple times in separate transactions, you can save your out of pocket amount buy redeeming airmiles cash! If not, you've got a bunch of extra airmiles to use next time!