Firstly, I do not have first-hand experience with this site, but I know many people who do, so take it as third-hand. One of the mailing lists I am on has a large number of members who need one particular drug which is not approved for use by the FDA, and is therefore very hard to get in the US, even with a prescription. However it is approved and available in pretty much every other country in the world, so lots of people order it online. Their favoured site for offshore prescriptions is
www.inhousepharmacy.com. From my limited research on it (I am sure you can look into it too), I got the impression that US orders get fulfilled from New Zealand, and no prescription is required.