If you get a used one, might not be that bad.

But a consumer Brother is probably the way to go. Always search the model number and see what people say.

I'll share my example. I bought a Brother DCP-L2540DW (networked, full-duplex B&W laser, scanning with ADF) in 2015 for ~$120 after tax. I've gone through one toner cartridge for ~$50, so total cost excluding electricity is ~$170 for me. I've printed ~3,700 pages so far, so average price per page for the printer has been ~$0.046. I get paper for ~$0.03/page, so total price all in was probably ~0.076/page. This will continue to go down, the printer's current drum life is still >8,000 pages and should last me at least several more years.

With ~100 pages/year that would have been ~900 pages so far. At 900 pages, that probably would have been fine with the included toner, so toner costs don't count. Assuming you turn it off when not printing so energy costs are negligible. That brings it to ~$0.16/page (with my ~$0.03/page paper) printed.

Printing at the FedEx shop is ~$0.23/page for B&W. The public library nearby has B&W printing for $0.15/page. So with ~100 pages/year its cheaper than a chain office shop but more than the library at this point. A few more years will shift that closer and eventually beat the library price.

I've just given up on the economics of photo printing at home. It seems to me you really need to print a lot of photos to compete with the ease of photo printing at most photo stores in the US. You'd need a really good photo printer to match most of the quality of online stores, so you'd need a pretty good printer with nice ink and paper. In-store pickup at a number of places usually means like an hour turn around or so.

Note though that overall my value for my printer is higher than just the printing. As mentioned, it is also a scanner I've scanned ~1,000 items with it.

Not sure exactly where the line lies between "consumer" and "enterprise". But, anecdotally, my employer (which is a pretty big enterprise) has small HP laser printers which cost a few hundred dollars (<500) with duplexers and wired network cards. The model is M402 or similar.

They've always worked perfectly on both Linux and Windows and need no maintenance, just remember to turn them on. Most of them are still on their original toner (we don't print that much).

Newer models seem to come with wifi, but I have no idea how well that works.

i got a free unit off of craigslist, nineties HP laser. Ive never changed the toner or added more paper than it came with. I did buy a pi for it to use as a cups server though.

At a 100 pages per year, your cheapest option is probably a bus ticket to a Kinkos.