My vet exam is a little more expensive at $55, but I am really picky...and I live in NYC which is ALWAYS more expensive than the rest of the country it seems.
Believe it or not it took me some time to find a good vet that knew about guinea pigs. That was the important thing for me. I know there are a lot of vets around here that deal with "exotics", but when I would call and ask questions about the doctor's qualifications, they would be specializing in birds or reptiles. Plus, it had to be close to home and weekend or late night hours. I feel like the travel stresses my pigs, so there is no way I was going to get in a noisy subway and travel for half an hour.
I love the doctor and I have had all my pigs examined. She is so knowledgeable and takes the time to do the same sort of exam that you would see done on a cat or dog. She takes temp, weight, checks the ears, nose, mouth, eyes, feels their glands and bellies, checks the genitals, and best of all...she asks me questions to make sure I am feeding them properly and caring for them. She cleans their ears and clips their nails as a courtesy. When I first got Alton, she knew I was a new owner and let me ask a good 20 minutes of questions without even acting rushed or inconvenienced like some doctors do when they have other clients lined up. The staff is friendly (a shocker for New York) and the wait is never more that 10 minutes on Saturdays.
So I don't mind paying a little extra.