For a limited time Amazon has the Kyocera Ceramic Coffee Grinder for only $27.99 + Free Shipping for Prime members. The grinder lists for $50.

Not only does this highly-rated (4.3/5 stars from 450+ reviewers) grinder put coffee through the paces, it'll also grind salt, pepper, tea, even sesame seeds. It never rusts and the ceramic is close to the hardness of the diamond.