Avery broad question with a very broad answer.
The short answer?
$0.00 to $2000.00
Reason?
There are beardies sold or adopted on this forum and others between those price ranges all the time and people willing to pay anywhere between those ranges for different genes.
A good way to get a real answer to that question (as opposed to my smart alec remark above) would be to post their lineage, if it's known. I.E. hypo, leucistic, high color, trans, etc etc etc etc. Then post some pics and it'd be a lot easier to judge what sort of range you should look to ask.