As someone stated it depends on what you have done that that will decipher what you pay, but also some areas are cheaper than others. In my area there are a lot of quality low cost clinics, other people can't find a single one.
As far as personality, as far as I know nothing will change. He may calm down a little bit but probably not much. A lot of people still have super hyper babies
I was worried my girl would change after spay but nothing at all has changed.