Check out Seymour Veterinary Clinic in Sevierville, TN if you don't mind driving a little bit. We had our guys neutered there when we were in TN and the vet is great!
(865) 577-8056 is there number. The vet is Dr. Rosemary Jones. They do both pom on and pom off neutering. It's 85 dollars (I know a little over what you're looking for) and she sends you home with some pain meds for them, as well as E-collars if you end up needing them.
There's also the Sevier County Animal clinic. They do neutering as well, but I'm not sure of the prices. We just had their wellness visit done there. (865) 453-1221