I never discuss the prices. Thanks to this forum I always have an idea of the current prices, take the girl, and after the service (be it massage, be it lt, be it st, or else) I give her the average price. They actually accept because the price of the forum is the real actual current price.
In PTY short-time from street-girls is invariably 400-500 baht. Long time 800-1500bt. Girls from beer bars is the same, plus bar-fine (500 ST 1000 LT + 200/300baht BF). Girls from go-go bars are consistently more expensive
In winter the prices go a up.
It is better never ask for the price. You know it, and she knows it too.