I've used some of the RaidMax and Sentry midtower cases that I got on newegg.com for $20-$30 after rebate.
I've never had a single issue with any of them with any screw or mounting issues.
of course you're getting thin steel, and lots of plastic.. but once you build the PC, it never moves, so who cares.
I'd have no problem recomending either of those company's entry level cases