About how much will teeth whitening cost?

I know crest white strips cost like $40, but about how much would it cost to get my teeth professionally whitened?
--------------------
Prices range considerably. You can get it done for as little as a few hundred bucks; you can also find some dentists charging over five hundred. It largely depends on office location (is it in a major metropolitan area? If so, expect the cost to be higher) and the overhead costs of the dental office (do you see a lot of staff members, and does the waiting room look like a hotel lobby? If so, the dentist will have to up his charge to account for this).
Source