Seconding this. I have an HP 4250, with three trays and a duplexer. Cost me $40 on craigslist from a bank closing. I've been running it for ~7 yrs, and only replaced the toner cart once. If all you need is black text/graphics, these things are workhorses.
Drivers are easy, works on good ol' USB, and a single $20 toner cartridge will last you a decade.