ESP-01MR — Ai-Thinker
ESP8266 WiFi module, 1MB flash, PCB antenna, tape & reel, 2500 pcs

Category: Module

Pricing
  LCSC         $0.68
  Mouser       $0.88
  DigiKey      $0.91
  Farnell      $0.95

Manufacturer: https://www.ai-thinker.com