How much does a petrified buffalo head sell for?

To find that out exactly, you need to know where the market is. I dont have exact info but I saw a petrified buffalo skull and horns on sale for 1500 on something called busacca. First of all, buffalo are not extinct so dont expect millions. Also, as with anything, condition is everything. How many pieces is it in, is it complete from jawbone to horns, is there damage from extraction, that kind of stuff.