Ltr-16*?

Where can I get the ltr-163, ltr-163D, ltr-165H, ltr-166 or any variation of the liteon dvd drive in retail stores? What are some possible rebadged liteon dvd drives?

OfficeMax, CompUSA, Circuit City usually have a selction of optical drives. I think Cendyne DVDs are rebadged Lite-Ons.