I can't say for sure because I'm not in the market for Burms...but I would imagine prices vary wildly from state to state. If a state has several decent-sized Burm breeders selling the same morphs, they may sell for less than a state that has one guy breeding a few rare morphs.
You don't say where you're posting from, so it's about impossible to know if anyone's experiences with price would be relevant for you.
Anyhow...best of luck! I hope you get a good deal on a nice animal!