Where can I find rare-earth magnets?

More magnets than you can shake a metal stick at can be found at Applied Magnets. I strongly recommend you order more than you think you need because: 1) They’re cheap. 2) You’ll go through them faster than you think. 3) If you don’t order enough, they’ll slap you with a ridiculous “low quantity” fee. You can actually order more, not suffer the fee, and pay less.