I bought it from Buy.com as a Norcent DP-501M which is just a re-badge of the LiteOn model. I flashed it with LiteOn firmware since it's kept more up to date. At the time of purchase, the LiteOn branded one had already been discontinued. It seems that the Norcent version is also not made anymore.

A quick look on ebay shows that neither are available at the moment, but one recently sold for only $46 + outrageous shipping. I'm pretty sure I paid somewhere around $170 for mine.