Question regarding body shop prices

My girlfriend's Infinity is damaged (dont ask in
3 places: dent in driver's door, dent in passenger's
door, dent in the rear+busted taillight. The dents
are not big. She went to a body shop today (recommended
by the Infinity dealer) and they gave her an estimate
of $9,000 and 3 weeks. I never had a need for a body
shop, so I have no experience with them, but these
people's price seems outrageous to me.

So my question is how does one go about
finding a cheap body shop? What kind of place
should we be looking for?

Thanks for your help!