Depending on where you are, consider something like the Samsung CLP315, Brother HL4040 or a Xerox Phaser. Prices seem to be very variable: our QMS was actually free, with a contract to buy toner cartridges through the supplier, who also guaranteed to be cheaper than the two major office catalog suppliers.
The toner never dries out or clogs the heads, either. Check the price of the drum unit, if it ever needs replacing: on my B&W Samsung printer, the drum unit cost more than a new printer.