Grinders come as a standalone item or as an attachment to a mixer.
It is possible to buy a traditional grinder (non electric) such as this grinder:.
For an electric grinder check out this model that comes with 3 grinder plates and a (veggie!) sausage stuffer:
If you have a Kitchen Aid mixer then this grinder attachment includes 3 grinding blades, 3 grinding plates and also two (veggie!) sausage stuffer tubes:
