Hi, I'm also from Idaho. Boise area.
We just started with chicks. We built our coop out of scrap wood. Tractor supply and D&B had some nice coops, but we felt they were a little small so we built our own. There are loads of free plans online also.
I'm five miles from State Line, Idaho on the WA side. Where are you? I would highly recommend building your own, or using a free or cheap shed off Craigslist and refurbish it. I have gotten tons of useful materials for free off CL. Those tiny coops they have for sale for an exorbitant price aren't worth it, and don't function well.