Uhm, aren't medications roughly the same price everywhere (with variations depending on the pharmacy, but not on the country)? I mean, in Canada, at least in my province, we do pay only 20 % of the price of medications, and nothing past 100 $ a month or so, but that's because as citizens, if we don't subscribe to a private insurance, we're automatically on the state's insurance. But the prices on the receipts, before insurance, those are rather high.
If anything, US prices may even be a little lower, since a lot of medications are produced there, and to Canada, there are additional transportation costs and perhaps taxes.
And uhm, I haven't looked into it at all, but I sort of doubt there are many online pharmacies in Canada. Isn't our country a lot less lax than yours on regulation in that field (and many others)?