Amazon.com: HiLetgo 3pcs ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module Works Great for Arduino IDE/Micropython (Large) : Electronics
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NodeMcu Lua WIFI Board Based on ESP8266 CP2102 Module [NodeMcu-Lua-CP2102] - US $6.20 : HAOYU Electronics : Make Engineers Job Easier
NodeMCU ESP8266 Specifications, Overview and Setting Up