Internet of Things (IoT) is all about connectivity. This page lists Arduinos with WiFi and Bluetooth.
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ESP8266 CP2102 $ 7.20
ESP8266 Uno D1 $ 10.80
ESP8266 with battery compartment and OLED display $ 15.55
ESP8266 with OLED display $ 15.60
ESP8266 with rectangular OLED display $ 13.80
ESP32 with color LCD display $ 26.44
ESP8266 GPS / GSM / GPRS $ 38.72
ESP32 camera $ 11.99
ESP32 2.13 inch ePaper display $ 20.70
ESP32 with OLED and Camera $ 33.14
ESP8266 with separate OLED display and DHT11 $ 23.56
ESP8266 smart watch enclosure $ 31.44
M5 core ESP32 320x240 $ 62.26
M5 core ESP32 with faces $ 112.22
M5 core2 ESP32 touch screen $ 72.04
M5 Atom matrix 24x24mm ESP32 $ 31.89
M5 stick ESP32 color LCD $ 45.57
M5 ESP32 E-Ink display $ 51.07
M5 ESP32 large E-Ink display $ 90.26
ESP8266 D1 Mini V3.0.0 $ 6.48
D1 Charging & Battery Boost Shield $ 5.17
D1 5V Relay Shield $ 4.14
433Mhz transmitter / receiver $ 15.96
HC-06 Bluetooth tranceiver $ 8.39
SD-card module $ 4.79