SparkFun
SparkFun Pro nRF52840 Mini - Bluetooth Development Board (DEV-15025)
£36.32Unit price /UnavailableGeneric / OEM
Teensy Prop Shield - LC - Low Cost (no Motion Sensors)
£6.47£9.48Unit price /UnavailableSeeed Studio
BeagleBone Green Wireless Development Board(TI AM335x WiFi + Bluetooth)
£64.62£97.00Unit price /Unavailable