Hello... sorry to hear your beardie isn't doing too well.
How old is your beardie and what have you been feeding him. He could be impacted if he has not gone to the bathroom in a few weeks.
Every vet is different... some charge more for exotics. It shouldn't be any more than $50-$100 for the visit. You can always call the vet and ask... they will give you the prices over the phone.