HP DVD840i Lightscribe DVD±RW Writer Retail Boxed Kit is £29.99 at Bigpockets.co.uk
Delivery is extra but Free for collection or if another Free delivery item is added to the basket. If you are intending to pay the delivery charge, better buy from Microdirect (see first comment please) where it is a bit cheaper.
What is Lightscribe? : Rather than using inks or labels, the Lightscribe method uses the laser similar to burning to the disk. Once you have created your disk you simply open the drawer, turn the disk over, close the drawer and run the label software. A greyscale image of the “label” is then burnt to the topside of the disk. This technology will only work on disks that are designed for this process.