Lidl were selling these simple colour ones a couple of weeks ago for £17.99 so they may still have stock left but many were hovered up by ebayers who are now re-selling for £25-£30+...
It's available in Black as well and has a mains adapter and the time updates automatically daily over the air.
Auriol Radio-Controlled Weather StationDisplays indoor and outdoor temperature (°C/F), humidity and weather forecast433MHz radio sensor with a range of up to 100mFeatures date and time display, 2 alarm settings, temperature warning, barometer and moon phase displayCan be wall-mounted
Batteries and mains adaptor included