there is a Dash 8 model made by a company called Hobbycraft. It includes decals for Piedmont I beleive, or at least Hensen. Around $30.00. I would just go to a local hobby shop and see if they can get it for you.
There is an aviation store in the mezzanine under the
chicago O'hare Hilton, they have the display models for just about everything, I know for a fct that they have the Dash 8 in USAIR livery I don't know the number but call Chicago info and get the number for the Hilto at the O'hare Airport and they should have it after all it is in their building. The models are pretty nice about a foot long or so, and cost between 20-40 bucks