I've used a HP deskjet for years on a IIcx/IIci. Now I need a "newer" one as they no longer make the green-cap ink cartridges, only the blue/purple ones. But it served me great for years. And it still works if there were cartridges for it!

Skewing it a bit - for a BW Inkjet Printer - nothing bets a Stylewriter II. They use the Canon BJ-01 cartridges.