Internet of Things (IoT) is all about connectivity. This page lists Arduinos with WiFi and Bluetooth.
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ESP8266 CP2102 $ 3.03
ESP8266 Uno D1 $ 4.07
ESP8266 with battery compartment and OLED display $ 10.50
ESP8266 with OLED display $ 12.37
ESP8266 with rectangular OLED display $ 9.28
ESP32 with color LCD display $ 7.46
ESP8266 GPS / GSM / GPRS $ 30.68
ESP32 camera $ 5.70
ESP32 2.13 inch ePaper display $ 13.16
ESP32 with OLED and Camera $ 15.28
ESP8266 with separate OLED display and DHT11 $ 8.10
ESP8266 smart watch enclosure $ 30.41
M5 core ESP32 320x240 $ 34.48
M5 core ESP32 with faces $ 76.57
M5 core2 ESP32 touch screen $ 53.12
M5 Atom matrix 24x24mm ESP32 $ 15.83
M5 stick ESP32 color LCD $ 20.50
M5 ESP32 E-Ink display $ 37.28
M5 ESP32 large E-Ink display $ 83.60
ESP8266 D1 Mini V3.0.0 $ 3.18
D1 Charging & Battery Boost Shield $ 2.19
D1 5V Relay Shield $ 2.05
433Mhz transmitter / receiver $ 1.41
HC-06 Bluetooth tranceiver $ 7.34
SD-card module $ 2.14