i used to live there . the only places you will have a chance is in bkk or pattaya . anywhere else and the chance of it being fake dramatically increases and so will the price .....

be warned countering is rife there , all the pharmacy's are at it and so are the expats .its either of ignorance or deception .
generics are everywhere (blue tops ... yellow tops blah blah blah .. dont be sucked in ....) the likelihood of you bumping into someone who has legit gear with be rare .
Pharmacy's are your best bet .but they too will try to rip you off or be ignorant themselves ... but do your ground work and dont go for the cheaper option i.e generics as they will be sh*t for sure ...............the only time i got the real deal was when someone got them from Europe or russia and brought them in .....