$300 is a rip for something that cost $10. they burn these by the boat load. If I find someone who has one can I burn an image on a DVD burner and will it work?
Part number GP9A66DZ0C (from the Ebay auction) was superseded by part number GP9A66DZ0D, which in turn was superseded by Part number GP9A66DZ0E.
Personally, I would take the version from two generations ago for the lower price but if you do want the most up to date version, the MSRP is $300. But just because MSRP is $300 doesn't mean that you can't find it cheaper, here's one for $240: