11/24/2020: Done a bit of reorganizing here. In the right panel are quick links to the contents of the site. Hope they help you find what you're looking for. On the orders page is a listing of what's currently available. You can just copy and past the listing to your email with your selections indicated and save some time. In the How To page I've added a MaxESP3 assembly tutorial. I'm going through a few hundred emails to mine questions and answers for the FAQs, so there's nothing there at the moment.
MaxESP3 - $40 Fully featured controller at a great price, moderate skill level.
MiniPCB1 and 2 - $45 Powerful 600MHz µprocessor in compact packages. Easy to assemble and program with Teensyduino.
STM32 - $22.50 Everything to build the BluePill, except the BluePill.
SHC ESP32 - $25 Features the 1.3" OLED display.
BHC - $10 Includes PCB, Momentary switches and RJ-12.
LV8729 or S109 step motor drivers $6 with Kit order.
PCBs, any of the PCBs for the kits may be ordered individually. $6 shipped in the U.S. $12 elsewhere.
Wemos D1 mini Pro and antenna substitution for D1 mini - $6.50.
HC-05 and BT adapter PCB for MiniPCB2 and STM32 - $9.
EQ-5 type mount motor brackets 2 @ $15. Provide 4mm of adjustment.
Aluminum enclosure for MaxESP3 -$14. Limited stock.
Aluminum enclosure for MiniPBC2 - $10. Limited stock.
ABS enclosure for the MiniPBC1 and BHC - $4