You could try Komplett or Amazon.
I recently bought (in Germany) an LG DVD burner, which
Writes to DVD-RAM (5x), DVD-RW (4x),DVD-R (16x), DVD+RW(8x),DVD+R(16x),CD-RW(32x) and CD-R(48x) media
connects to the laptop via USB interface. Nice drive and it was a good price in Germany - EUR100