Amazon.com: HiLetgo UNO R3 D1 R32 ESP32 ESP-32 CH340G WiFi+Bluetooth+UNO Development Board WiFi Bluetooth 4MB Flash with Micro USB for Arduino : Electronics
Uno+wifi R3 Atmega328p+esp8266 Ch340 (32mb Memory) 6v-9v Usb-ttl Ch340g For Arduino Nodemcu Wemos One Development Board - Integrated Circuits - AliExpress
Arduino Uno R3-compatible with ESP8266 and external Antenna — PMD Way
Help connecting to WiFi Uno R3 - Microcontrollers - Arduino Forum
Amazon.com: Songhe Mega2560 + WiFi R3 ATmega2560+ESP8266 32Mb Memory USB-TTL CH340G. Compatible for Arduino Mega NodeMCU for WeMos ESP8266 : Electronics
Amazon.com: DWEII 2 Pack ESP32 for Wemos D1 Mini for Arduino UNO R3 D1 R32 WiFi Wireless Bluetooth Development Board CH340 4M Flash with Micro USB for Arduino : Electronics
Xiaomi Mi WiFi 3 Router Unboxing, Teardown, and Serial Console - CNX Software