You probably meant double-hung.
Regardless, for just one window, the bigger companies aren't going to give you much of a deal, so you need a smaller, independent carpenter.
Call Brunsell Lumber for a referral. They are really nice folks and will only recommend a skilled tradesman.
If you want to do it on the cheap, buy the window at Home Depot and hire a handyman to install it.
Before you have anyone come over, you need to decide if you want a new construction window or a replacement window.
Explanation in this thread:viewtopic.php?f=42&t=48796&p=609042