e-buyer have a special deal on this for this weekend only.
Panasonic DVD-R/DVD RAM/4.7GB Combo IDE Internal Drive - OEM + S/W VOB 6.5
Weekend Only Price
£109.99(ex VAT) £129.24 (inc VAT)
304 in stock
I don't know the spec's for it, but if you want it you will have to be quick.
4.7GB DVD-R disks can be as cheap as 45p each.