Probably their basic black & white laser printer. The exact model number changes over time whenever they introduce the next generation. I'm sure if you need color printing they have an option for that too for a bit more money.
If you go to the Brother website and view all laser printers, sort by cheapest, select the filter for print/scan/copy. There are two options with different model numbers and a small price difference, one has a basic multi-character LCD display and one has a touchscreen (apparently with a faster processor, since the touchscreen one is rated for a few more pages per minute).
I purchased the LCD display one around 2 years ago, can't remember the model number of that one, and then gave that to someone else and got the HL-L2395DW a few months ago. Both were around $160-170 new. It seems the touchscreen has gone up in price recently to $200; the HL-L2390DW alternative is still $170.
Linux support is pretty good. Both printed out of the box (use ipp / AirPlay when adding to CUPS instead of going through the drivers); for the new one I had to manually install the drivers to get scanning to work. Was pretty easy.
