I have not ordered meds from Canada but here are a few facts which you may already know.
1. You need a valid prescription, written by a licensed USA physician, for up to a 90-day supply of each medication with up to three refills.
2. Anyone with a credit card, a phone (or fax) and a valid prescription can order medicaitons from Canada.
3. Upon receipt of your American prescription and information requested, a Canadian Doctor will review your information and issue a prescription that can be filled in Canada.
I did a search and Nexium 40 mg tabs, 30 tabs = $99.86 + $15.00 for shipping. That was only one pharmacy but just to give you an idea on price comparison.
I hope you are able to get the medication you need.