I think that might be slightly high, I've seen them around that size for beween 14-25 dollars. But if you rarely see them for sale at that size in your area, you might not mind paying a little more if you're like me and need to have a particular fish.
Also, on a Butti that size, you might be able to haggle if it's been there for a while, taking up valuable tank space. They don't often order Buttis that size, likely was given or traded to the store.