I'll climb onto my soapbox and make a couple of comments.
First, nothing I say here applies to ANY brick and mortar pharmacies in Canada - as a PP mentioned, they are regulated at least as well (if not moreso) than US pharmacies. If you are sending your Rx to a physical drugstore that just happens to be in Canada, this information does not apply. If I were on vacation there, I would not hesitate to get a prescription filled at a pharmacy. That being said...
Many online "Canadian" pharmacies are not Canadian at all - storefronts with an address in Canada that are actually located elsewhere (and it could literally be ANY where).
One of the many problems here is that it IS illegal...I believe the regulation was summarized quite well earlier in the thread. There is a lack of enforcement, but that doesn't make it any MORE legal. Even a "3 month supply" is not legal - but as stated, officials look the other way.
Another problem is that when you don't really know the first thing about the pharmacy, you also don't know the first thing about where their drugs are coming from. Say what you will about the FDA (and I am not always on board with them either), but there are regulations in place for a reason. If you have ever seen the amount of documentation that is required for the manufacture of prescription medications, you would see the many safeguards in place to help guarantee uniformity, potency, and purity. (Yes, I know the safeguards fail sometimes, but that is a different thread...). Even medications that are manufactured overseas for distribution by a drug company here in the U.S. are governed by FDA regulations.
If you order your medication from a less than reputable pharmacy, you have no idea what, if any, safeguards were in place when they were made. Are they rejected lots? Are they expired? Are they perfectly fine but didn't meet some menial criteria? Or are they really perfectly fine?
You will hear a lot of anecdotal evidence that says "they are fine, I've been using them for years" and so on. In many, or even most, cases, this may be true. I would just be remiss if I didn't point out the danger, however small the chance may be, of possibly getting something that is not quite the same.
I would urge you to look for an online pharmacy with VIPPS approval (
here). In fact, if you look closely at the NorthWest Pharmacy site, there is a disclaimer that says "Not all prescriptions dispensed by PharmaWest" (the location in BC) - so where ARE they coming from? I have searched and I can't find anywhere that generic Flovent (inhalation) is approved. I could be wrong and missed it, but I've looked.
Finally, the comment someone made about Wal-Mart's $4 drugs...they get their medications from the same warehouses that everyone else does. I've been on rotations in 6 different pharmacies in the area and the same delivery guy comes to all of them - from the hospital, to the small independent store, to Wal-Mart. In medication (as with everything else), purchasing contracts and buying power dictate the cost as much as where they come from. Yes, some of the drugs come from overseas (again, manufactured by US based companies under FDA regulations) - but many of them are from the US. And FWIW, $4 drugs are loss-leaders in many cases...not making $$$ for the pharmacy on those.
There are patient assistance programs as well...you may or may not qualify, but here is a link to one for GSK (Flovent manufacturer):
http://www.rxassist.org/pap-info/company_detail.cfm?CmpId=125
Sorry this was so long. You may do it and find you have no problems at all and I understand that it is a lot of money that you are saving. I just think it is interesting on a board where buying "scrapper" pins off ebay for $1 each is frowned upon, buying what could be the equivalent of "scrapper" drugs online is encouraged. And again, no offense intended to my dear Canadian friends - I think Canadian drugs are fine!