I use Costco's online pharmacy. I've had good luck with them and found their prices to substantially lower than Walgreen's. This may have changed, but I have found some drugs there to be as much as 80% less than Walgreen's. I have worked it out with them and my doctor so that I usually have a 3 month backup supply. I have them shipped to my local private mailbox who will forward them to me wherever I am, although I could see that this may become an issue in far away places, but it works well if I am in the US or Canada.