This repository contains documentation, software, schematic, PCB files and other information for the Modtronix esp32MX-E board. This board is available on Crowd Supply until the campaign ends:
https://www.crowdsupply.com/modtronix/esp32mx-e/crowdfunding
After that, it will be available on www.modtronix.com, and most likely also for sale at www.mouser.com