I have about 20 or so font cartridges for my old HP printer. Of course, some of them are PostScript and HPGL (for emulator a pen plotter), but most of them are bitmap fonts. But then some of those fonts (BitStream, etc.) were horribly expensive as I recall...
But there is this:
There may be some public domain bitmap font files floating around too...
But of course, the app needs to support them. I used a tiny bitmap font in my "titty" eink algorithmic art script: