There are others. I used to order from Mexico but the government clamped down on mail order and one of the major pharmacies ran into financial problems. Also, the prices went up a lot for some reason.
Sometimes you can find things cheaper on eBay but I would not recommend it unless the seller is traceable to one of these same large international pharmacies, not just a guy selling out of his mailbox. Also, the best drugs to purchase internationally are ones for which the effects (or lack of) are readily apparent. For example, I would know within a single dose if a Proton Pump Inhibitor (like Prilosec) is working or not. In the case of the antidepressants, which came up on the thread earlier, you might not know for weeks and still not be sure. Traditional antibiotics should be fine from the major international pharmacies as the production is relatively low-cost and the technology is universal. The margins are small and there is little incentive to counterfeit.
Thanks for the advice. Yeah, it would have to be legal with customs and I bet there are all kinds of restrictions.