Fees will always vary from one practice to another, but orthodontics fees can run anywhere from a few hundred to several thousand dollars depending on the complexity of the case and who treats it.
Likewise for "whitening." Fees for home bleaching trays typically run a few hundred dollars, and the more invasive in-office procedures get more expensive from there.
Then you have geographic variation, specialists vs. GP's, etc. Your best bet is just to pick up the phone and call a few offices to inquire about their fees.
(Before anyone gets on my case for applying double standards, notice that nowhere did s/he ask for treatment advice. 😉)