pixelprimer
You can get the PCB from JLC https://github.com/jcmkk3/trochilidae
I’ve also got 3 pcbs left I’d give away for the cost of shipping Australia. Last I checked it was 15 usd to the US
Built it, it’s a cheap diy option called the Cheapino https://github.com/tompi/cheapino
Pretty affordable option though at low key count you could likely get a better build for a similar cost. Keycaps are whatever cheap aliexpress I could find hahaha.
Doing it again I’d go for the badwings that Hazel just posted here
It’s using a low power sensor PMW3610 so not really haven’t had it run out of battery yet to test haha.
There isn’t an offical wireless version, the designer is working on an opensource controller to use instead of nice nanos and waiting for offical ZMK support this is a mod. http://docs.bastardkb.com/help/bluetooth.html
Not a build guide available for this at the moment. I used the offical build guides for the wired version just swapped out the sensor PCB and Holder, using my own slightly modified holder for the nice nanos to move the reset and power to be more reachable.