I bought a Eureka Mignon second hand recently. As above it’s built like a tank and is nice and compact. And fairly simple. And user serviceable. And good availability second hand if you take your time.
Previously I was using a Bodum Burr grinder. This did the job for aeropress but it doesn’t grind fine enough for my espresso machine. And now I have the Mignon I realise that even for aeropress you can make a much nicer coffee with a better grinder.
NB there are quite a few grinders that are good for brewed coffee but won’t get there for espresso, so your choice depends on how you brew.
If you want a bodum one I’m looking to get rid of mine and I don’t suppose it’s worth much second hand. It’s in good nick.