I think that at least in the United States if not in other countries, Walgreens is a pretty common drugstore. I happened to be in one the other day and noticed that many of their supplements were Buy 1 Get 1 Free. I looked them over and they had a pretty good selection. I didn't purchase any, but I did ask at the register how often they sold them at that price and she told me a lot. Sometimes she said they are on sale like that a couple times a month for a week at a time. You may want to check it out if you have one anywhere near by. We all know how expensive supplements can be and if we can save a few bucks, why not?