Sadek Baroudi's Baby Groot Keyboard is a cheap (or free!) split PCB with a lot of features.
KBD.news Published November 26, 2021
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The bgkeeb (stands for Baby Groot Keyboard) is a reversible 100mm x 100mm PCB with support for MX switches (no hotswap), per key led, rotary encoders, and exposes the SDA/SCL/GND/VCC lines in the form of the pimoroni trackball pins.
Given the PCB is so small, PCB prototype manufacturers will fab this for very cheap, or even free.
As of this writing, nextpcb will fab and ship this keyboard 100% for free (in green only). jlcpcb will fab and ship these for $2 (USD) – sadekbaroudi.