I brought all of my herps for a check-up a little while ago. Although it isn't necessary when your animals are in good health, I wanted to have them looked over by a vet and have files opened for all my animals.
A basic exam doesn't comprise of much. A close visual examination of the animal from head to tail, an examination of the mouth, eyes & nostrils. Then the animals is weighed and fecals are done (highly suggested) if you brought some poo with you. All is noted: sex, age, weight, length if possible. I like that my vet has seen all my pets and has a file on each, if there is ever a problem, there is a reference for the vet to start with.
I think the most important thing is to have fecals done on your animals. It's surprising how many have internal parasites!
As for cost when I first called, I was quoted 44$ for the first animals and 27$ for each afterwards. Considering I had a dozed to bring in, I was a bit shocked!!! When they found out that I had so many animals, I was given a good rate, basically the hourly fee for the vet which turned out to be around 100$ after taxes. Quite a saving!!! Ended up costing me less than 10$ per animal
My vet suggests an initial check up and then visits every 2 to 3 years when all is well. Obviously if something is up, I bring in my pet right away.
I don't feel that check ups when all is well are absolutely necessary, nice if you can do it. Fecals are necessary and as long as you are very observant of your pets and give them medical attention when needed, that's what's really important.
Pixie