Well, in Canada, you can buy 1 can, which I guess is 350mL (I don't have any cans on hand at all), with $1. At least it doesn't cost more due to the CDN/USD exchange rate, but I feel bad we can't buy more cans like other countries can.
Maybe up in Attawapiskat! I've seen a 12-pack of coke for for $20 CAD!
I just showed above where you can get 6X710ml bottles for $2.49 CAD which is just under $2 USD so given that 1X710 ml bottle is worth 2 cans, you can get 6 cans for $1 USD!! You need to shop around. At Costco you can get a cold 500 ml bottle out of a machine for $1 CAD.