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Amazon [amazon.com] has Klein Tools MAG2 Demagnetizer / Magnetizer for Screwdriver Bits and Tips for $7.48. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]MAGNETIZER / DEMAGNETIZER: Makes your screwdriver magnetic using powerful Rare-Earth magnets[*]SINGLE SWIPE MAGNETISM: Powerful Rare-Earth magnets provide immediate magnetization and demagnetization of screwdriver tips