In the late 90s I had inkjets. I hate inkjets and never want to see one again. In retrospect I think they are the worst printing technology that ever succeeded in the market. I'd rather have a dot matrix than an inkjet. For all their limitations, at least dot matrix printers actually worked. Inkjets are anger in a can.
I bought a used Laserjet 5 on eBay a few years ago, I think it cost something like $60 total, half of that was shipping. It's not hard to find stuff like this being liquidated in large numbers. Mine was made in 1997. At the time It had about 25k pages on it, which is low for those printers. I don't know what the page count is now.
If you look at buying a 2nd hand printer, the page counter is good information to have, but be aware that it's technically possible for the counter to be changed, if the seller is unethical and knows how to do it. Also, the way the counter works is a bit goofy, and this can make it inaccurate for some usage scenarios.
I've read that it's a bad idea to buy a printer that comes with a toner cartridge inside, because they can spill and make a huge mess. Also keep in mind how heavy these things are. It would be easy to mess up the shipping. Buy from somebody who has experience selling similar printers on a regular basis, so you know it will be shipped properly. Buying from an inexperienced seller can be a risk because they're much more likely to make a shipping mistake.
Sometimes old laser printers show up in thrift stores, but that's a matter of luck.
I use my LJ5 daily. I've added a JetDirect card for connection over ethernet, but this function doesn't work quite right. I don't know if it's just my card, or if it's a flaw in how they're programmed. If I start one print job, then start sending others in a fairly rapid sequence, it will drop some of them. It apparently has a period during the printing process where the network link goes deaf.
Nowadays I usually print from a PC that's sitting next to the printer with an LPT connection. LPT has always worked perfectly, it's just the ethernet that's quirky.
I love the cheaply available toner and the simple fact that it works every day without being a source of stress. Paper jams only happen if I try to fill the paper completely, so I don't do that.
It has recently started making a sort of scraping/grinding noise at cold startup. I should probably find out more about that, I wonder if there's something that should be lubricated.
I wish I had a 500 page (really a bit bigger) tray. I have the standard 250 page tray, and trying to split a ream exactly in half isn't realistic so it ends up taking 3 loads per ream. I don't like having partial reams laying around, I'd rather drop whole reams in at once.
The Windows 2000 driver is better than the XP driver. XP uses a Microsoft supplied version which has some features removed. It's not a real big deal though. I thought Microsoft broke support for these printers starting with Vista, but maybe that's wrong. Anyway, there is the option of adding a PostScript module, and I would think that should expand the compatibility to almost anything, unless I'm wrong about how that works.
RAM expansion is done with 72pin SIMMs, but it's particular about what type of SIMMs it will accept. Things that "ought" to work, won't work because they aren't jumpered the right way. I don't remember the rules anymore, but it was detailed on some web site a few years ago and I assume the site might still be out there.