Lidl will have these Silvercrest Bluetooth car radios instore from Monday 25/11/13 for £49.99 which seems reasonable.
Product Information :-
Versatile CD/USB/MP3/WMA playback with handsfree function via included external microphone
Integrated memory card reader and USB port for connecting external devices
Powerful 4 x 40W output
Sleek removable control panel with dimmable display
3 year manufacturer's warranty