Free Parrot Bluetooth Minikit (worth £49.99) when buying a mobile phone from £19.99
The offer was noticed in Halfords "Guide to in-car technology" brochure. WINTER 2009/10 Edition. The offer is on pages 15 and 20 (images to follow soon!)
The cheapest phone is the LG KP190 (£19.99)
However the offer doesn't appear to be working online so you will need to redeem in the store.