AReResearch - Andy Reischle: Using the ESP8266 as a WiFi range extender
WiFi Communication Between Two ESP8266 Based MCU Through the Home Router - Instructables
Amazon.com: MakerFocus 2pcs ESP8266 NodeMCU LUA CP2102 ESP-12E Internet WiFi Development Board Serial Wireless Module Internet for Ar duino IDE/Micropython with Free Adapter Board for ESP8266 ESP-01 and nRF24L01+ : Electronics
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WiFi Communication Between Two ESP8266 Based MCU Through the Home Router - Instructables