I used eight small disc magnets in this Raspberry Pi computer case that my daughter and I designed for playing the early 1980s game Wizardry: Proving Grounds of the Mad Overlord, and I have 112 magnets left over. The pack of 120 costs $10. I don't know if they're neodymium, but they're strong for their size. I'm planning to use them, whenever feasible, as a superior substitute to screws in every 3D project I make.
If you're attending Maker Faire this year, come to our talk and say hi. I'll give you a magnet, if I remember to bring them with me.
