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ESP8266 D1 Mini V2 ESP-12F WiFi Module - ProtoSupplies
Amazon.com: HiLetgo 1PC ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module Works Great for Arduino IDE/Micropython (Small) : Electronics
Amazon.com: ideaspark 3pcs ESP8266 NodeMCU CH340 ESP-12E WiFi Wireless Internet Development Board Serial Module with Micro USB Cable Works Great for Arduino IDE : Electronics
NodeMcu Lua WIFI Board Based on ESP8266 CP2102 Module [NodeMcu-Lua-CP2102] - US $6.20 : HAOYU Electronics : Make Engineers Job Easier