Plasti craft models who I buy from http://www.miniaturemarket.com/pcgoldwest-06.html
has some easy and nice wild west building that are made of foam core and pretty inexpensive.
It come in a flat pack and is just plan foam core but it is very easy to scribe the walls with a blunt tool to give the wood grain effect. Not all that keen on the resin door(just does not seem to fit right) but for $5 you can adjust it to your liking. I added the side door with left over pieces and use tissue for the tar paper roof, a few more modifications and I'll have another building for the town of "Hellish wells"
few more pictures on the blog
http://bandit86.blogspot.com/