When I asked my vet (dog vet) for advice about searching for a herp vet, he said that when I find one I should ask simply "what does a regular check-up for snakes consist of?"
He said make sure they mention urate/fecal matter testing and blood tests... if that's not their first response to my question, then he said he'd keep searching. Unfortunately he couldn't recommend any to me as he's new to the area :(