USB2 powered DVD drive?

Hi all,

My newlap top IBM ThinkPad X40 does not have a built-in DVD drive. However, it does have a proprietary USB2 powered port (just seems like 2 USB2 port put together :p) and a PCMCIA slot.

Does anyone know where in UK to get a cheap DVD drive that can run of my laptop without the external power adaptor? I really want to be able to watch dvd on the move, not at home :p

Thanks in advance,

NTD