Towns With Cheap Houses?

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After my wife and I bought a beautiful house in Montana for $17,500, we built a web site about nice towns with cheap houses. Our subjective criteria:

1. Population between 4,000 and 80,000.
2. A good library.
3. A good grocery store.
4. A movie theatre.
5. Cheap houses: at least six for sale under $50,000.
6. The town "feels" good.

I want to expand the site, and would love it if any of you know of towns that fit these criteria (We have about a dozen on the site already). Thank you in advance.