Maple ESP32 Mini – The Smallest ESP32-PICO-D4 development board$9.90
Noduino Quantum ESP32 Board – WiFi & Bluetooth open source hardware IoT (scheduled)
Noduino Quantum ESP32 Board is an open source hardware for IoT. The main chip is ESP32 which supports WiFi & Bluetooth and It’s with powerfull process. The board provide a CP2102 for UART and Debug. The external SPI Flash is 16MB.