Hario Mini Mill Slim. It's not fantastic, but it's a burr grinder, and it's consistent enough for french press in my experience. Too slow for fine grind settings though. Bought one as a student ~15 years ago. Options were much more limited i.e. nonexistent at that time, but it's still my camping/travel hand grinder.

1zpresso grinders are fantastic and (as you said earlier) a buy-it-for-life thing. But if you're struggling with cost, a Hario is much better and not much more than an electric blade grinder.