Front Bumper

Hi

My wife just came home and told me she hit the front bumper off a large rock
will pulling out of a drive way. It will need a replacement bumper and I
have a few questions that I hope some of you can answer. By the way it's a
ION 2004 Sedan 1.

1) How much does a front bumper cost?
2) Is it easy to replace or will I need to get it done professional? I have
a bit of experience but not much. Also is it just held on by bolts?
3) Anyone know of any web sites that sell bumpers? I had a quick look on
google but the sites that it listed none of them sold bumpers just hoods and
fenders.

Thanks