Adafruit 2633 Bluefruit LE SPI Friend Bluetooth Low Energy BLE

Adafruit-Bluefruit-BLE-Bluetooth-Low-Energy-Boards-Adafruit-2633-P-The-Adafruit-Bluefruit-Friend-Bluetooth-Low-Energy-Breakout-Board-lets-you-cut-through-the-pile-of-Bluetooth-Classic-APIs-development-tools-and-licences-and-treat-a-Bluetooth-LE-connection-just-like-a-serial-link-Send-and-receive-keystrokes-from-your-favourite-terminal-software-from-software-such-as-Python-via-PySerial-or-from-your-smartphone-Adafruit-have-built-a-software-stack-right-into-the-Bluetooth-LE-board-so-yo

Price: 22.31 from Rapid Online Rapid Electronics Ltd.