External USB DVD/CD-ROM drive (reader/writer) (Hungerford Rd N7)

Hello,

I'm looking for an External USB DVD/CD-ROM drive (reader/writer) to use with a laptop.
Mine has broken and I was wondering if anyone has one they no longer use/need that needs a new home.
Don't need anything fancy just as long as it works and can read & write DVD's - both single and dual layer formats.

Thanks,

Mark