Don't buy anything too cheap. Now there are many legal pharmacies on the internet, such as drugstore network, Kang Aiduo and so on. Online pharmacies will be cheaper because you don't have to rent a house or anything. I bought some medicines in Kang 'aiduo several times, all of them are genuine, and the price is OK. You can see more regular pharmacies and compare prices before deciding. You'd better be careful of those messy websites. . .