The cheapest Brother laser printer is $100 + ink.
At $1/mo, it's going to 6 years (thanks Ansil) for the price to work out in favor of the Brother.
And to the people saying brothers last forever: they don't. I've owned 3. When the drum wears out, the printer is trash because brother charges almost the cost of the printer for a replacement. That $100 brother has a drum that costs $89 and lasts for 12000 pages. So 12000 pages is the life of that printer.
Edit: Re: ink drying out. HP doesn't consider printer cleaning and maintenance pages in their page count. So you can actually clean the printer regularly so the ink doesnt dry out, and they'll keep sending you new cartridges.