To add to this useful post - you can get second hand grinders from cafes quite cheaply. To avoid the massive ones, the models like the Super Jolly can be fitter

To add to this useful post - you can get second hand grinders from cafes quite cheaply. To avoid the massive ones, the models like the Super Jolly can be fitter with an entirely compatible hopper from a mini. The Mazzer ones are indestructible and can be painted to look pretty special. They might not have quite the kudos of the fancier models though, and are more of a dependable workhorse.