If you mean in Patong, it varies from about 60 baht to 100, depending on where and at what time you drink (happy hours etc!). Clubs will/can be more expensive.
Cocktails usally start at 100-120 baht from what I remember!
Use the search engine to look through this site, or you can always google some bar names, as most websites have drinks menu's for some reason (Not as if you can order a internet take-away!).
