A vet visit will cost around $40.00, at least in my area. A fecal check is $22 here. However, the local vet here will do a discount for multiple herps, with each additional animal being only $3 for the exam itself, so although the fecals are still 22 apiece, it's a LOT more affordable to take them all in for a checkup every year.

Just as you wouldn't think twice about getting a new puppy his exam and shots (even if he was free), don't hesistate to do the same for your snake. Just be sure that you search around a bit and find a local vet who has a good reputation and experience with reptiles--many vets have little to no experience treating herps. There are decent herp vets in most higher-population areas now, though.