My vet doesn't charge anything for nail clipping but I did have a nail experience with another vet. My daughter rocked the rocking chair on his toe and pulled off a nail (ouch) - I had the nail but I wanted the vet to take a look at it to be sure that everything was alright. We didn't go to our regular vet because he was out of town. We had used another vet in the past so I took Rowdy to him. He looked at the nail and said, "yep, it's gone" (I knew that since I had it in my hand). Then he clipped all the other nails (didn't ask me if I wanted him to) and gave me a bottle of antibiotics to keep him from getting an infection and charged me $130 (it was not an emergency vet)
If I had been able to go to my regular vet, it would have only cost whatever the antibiotics cost and that is all. My vet is a country vet and he only charges you for whatever you use - he doesn't charge a examination fee - and his charges for lab, medicine, etc are very very reasonable.