MicroCenter B&M stores have the AMS Electronics mATX Mini-Tower case (model CF-495A) with a 150w PS for only $19.99 + tax. Not bad for those looking to build a small, simple PC. Bought one this morning, but haven't installed any components. Case seems relatively good quality, though I don't like the lack of external 3.5" bays and the molded floppy port.
CF-495A case
CF-495A case