Espressif ESP
Espressif ESP8266 and ESP32 are a series of low-cost, low-power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth. These small modules allow microcontrollers and platforms like the Arduino to connect to a Wi-Fi network and make simple TCP/IP connections. You can even use them like an Arduino, and take full advantage of their powerful computing and networking abilities.
The boards below incorporate an ESP8266 or ESP32 chip. There are plenty of tutorials and beginners guides available on the web.
D1 Mini ESP8266
ESP-12 ESP-12F CH340G V2
Pay it in 4 payments of $2.20 with 
| Buy 1+ | $8.80 (incl. GST) |
ESP32 Development Board - 38 Pin - ESPWROOM- 32S
WiFi & Bluetooth Antenna Module 2.4GHz
Pay it in 4 payments of $4.85 with
| Buy 1+ | $19.40 (incl. GST) |
| Buy 10+ | $17.50 (incl. GST) |
Pay it in 4 payments of $16.25 with
| Buy 1+ | $65.00 (incl. GST) |
RGB LED Controller Module
ESP8266 ESP-01 ESP-01S - 2 LEFT!
Pay it in 4 payments of $1.20 with
| Buy 1+ | $4.80 (incl. GST) |
ESP8266 development board - NodeMcu Lua Wifi V3
WIFI Internet of Things - CH340
Pay it in 4 payments of $2.88 with
| Buy 1+ | $11.50 (incl. GST) |
WIFI wireless module wireless - ESP-01 ESP8266...
Internet Of Things Wifi Model
Pay it in 4 payments of $1.60 with
| Buy 1+ | $6.40 (incl. GST) |
| Buy 10+ | $6.00 (incl. GST) |
ESP32 Development Board CH9102X
WiFi+Bluetooth Ultra-Low Power Consumption
Pay it in 4 payments of $3.62 with
| Buy 1+ | $14.50 (incl. GST) |
ESP32-CAM Development Board
ESP32 Serial Port with OV2640
Pay it in 4 payments of $4.38 with
| Buy 1+ | $17.50 (incl. GST) |
ESP32-DevKitC core board ESP32 development board
ESP32-WROOM-32D
Pay it in 4 payments of $4.38 with
| Buy 1+ | $17.50 (incl. GST) |
