I don't take my snakes to the vet unless there's something wrong (a burn, RI, if I've noticed parasites in the feces). It's not worth the cost for me or the stress for the snake. The exam fee for my vet is $46, and that's pretty typical. Most vets will check for things like wheezing, they'll check body condition, ask questions about feeding habits, things that you can mostly do yourself. My vet sees mostly snakes with RIs and are skinny so when I bring in mine that are in fantastic condition with comprehensive feeding cards there's not a whole lot she can do. I've taken two in - one for parasites in the feces and the other for an RI. Those are not things I can fix on my own, or with assistance from the community. The snake not eating is something I can fix on my own without having a vet attempt a force-feed on a snake off feed for the breeding season.