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Speaker or diskdrive magnets, as noted above. If you have to buy one, probably cheapest is Home Depot...they're on the same aisle with the chain, sheet metal, etc.
Where is the best place to get a magnet to set your tpms?
A friend or relative would be the best place so you won't have to spend any money. If you need to purchase one Home Depot or Lowe's should have what you need.
I don't see what city/state you are in or I'd offer to loan you mine. I have an extremely high-powered magnet that came with my neuro-stimulator that is more than sufficient to reset TPMS.
The replacement cloned sensors I have in my car are RF triggered, magnet won't work. Bought a RF trigger/magnet tool. Mine was $150, and I use it quite often. Works great, 30 seconds and done.
If you don't have an old speaker handy that you can take the magnet out of, try Radio Shack.
I got one at Radio Shack. It was a rectangular one about 1" x 2" x 3/8" for only a couple bucks. I place it in the barrel of the wheel where it is closer to the sensor than at the stem. It has worked on all the OEM and Schrader sensors I have tried. (5 sets that I swap between cars. -- some early style and some late style)