Canada takes US stamps. Go to USPS.gov and you can look up the amount of postage. I put two stamps on a letter to my friend, but think I overpaid for convenience.
I love your auction. I remember Hersheyets...and I love the price printed on the bag. When I was a little kid (I'm a LOT older than I look <---) candy bars were a nickel. OMG!! I loved Hershey bars, but as far as Hersheyets vs M&Ms, M&Ms win hands down. Obviously, they still make M&Ms!!