Idaho is kinda big... Where are you looking?
Idaho has the lowest health care premiums of any state in the union, so if you are doing this insured, then you already are on a good start just being in Idaho. I don't know if he is doing it anymore but Dr. Peach in Post Falls was really good, if you are up in North Idaho.
Price wise, I don't know.
Actually... just did a google search he is in business
Peach Orthodontics
Orthodontist Dr. Karl Peach - Serving the North Idaho area including Post Falls and Coeur d'Alene
1145 E Polston Ave
Post Falls, ID 83854-6045
Even if your not from the area, just call in and inquire.

(208) 777-1010