If you have any problems ordering through any of these websites, or if you find others that give deals as good or better, please email me at firstname.lastname@example.org and let me know. You're also invited to check out chapter 8 of my book Retire and Travel - 20 Years Later, entitled Reducing Medical Expenses. There, I go into various approaches to saving on medical insurance, alternatives to consider, what I'm doing, and of course, Mexican and Canadian Drugs.
2011 Update: I recently learned more about Walmart vs Walmart vs Costco. I went to buy a 90-pill prescription of Simvastin (Cholesterol reducer) at Walmart in Florida and learned it was $48. Instead, I got it from the VA for $24. Later, I found that at Walmart in Fort Payne, Alabama, it was only $12. When I asked Walmart, they said that their prescriptions are different prices at different locations. Here's the Zinger! I later checked Costco and found I could get a year's supply, 360 pills, for only $25! Wow! I had to drive 40 miles to Orlando to get to a Costco, but it was well-worth the trip.
2016 Update: Costco listed all their prices online in 2006, but now I go there and can't find them. I assume they're still doing that cheap prescriptions thing, but don't use it myself. Regarding the Canadian links, I've not used them either, but the websites have been there for over 10 years, so maybe they're reliable.