You can buy a decent Brother monochrome laser printer (auto duplex, wireless, and wired networking) for ~$60-80 on sale and the generic toner for $10-20 for 2,600 pages.

For most people this is a far better option than buying the Brother brand toner. Worst case, it ruins the printer and you buy another one for that $50! I have had great success with the generic toner so far, nothing ruined or leaky yet.