Zinc
This one will cost you a couple of coffees, but it’s worth it if:
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you want to keep a record of you implants
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Have a Blinky that you want to blink
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Have a Magnet you want to excite ( in tandem with the LODESTONE Pico )
A bit more than just a couple of coffee, but a compliment to your bio-magnet and ZINC,
A Lodestone PICO is a USB-C dongle that allows you to effectively feel sounds using an implanted biomagnet such as the Titan or xG3. OR alternatively make your own