ESP-07SR — Ai-Thinker
ESP8266 WiFi module, 4MB flash, U.FL antenna, tape & reel, 2500 pcs

Category: Module

Pricing
  LCSC         $1.19
  Mouser       $1.52
  DigiKey      $1.53
  Farnell      $1.69

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