Todd,
Are you looking for 'Cheap' or 'Dirt Cheap'?
I built my hangar with tri-fold doors for $300 using used lumber and corrugated tin. I bought some new hinge and roller hardware, and found the track off an old barn.
The doors are in three sections each, with the inner ones hinged to swing open to the second, or middle one.
The middle and outer sections accordian open so they do not go out beyond the width of the hangar. Took some redneck engineering, but it works pretty good as long as I can keep the birds out of the track. I will admit it's on my own property so I don't have to worry about the "airport rules".
I thought I had a picture, but can't find it at the moment. I can go take a couple and post them in the next couple days if you are interested.
Corey