The combo slim HD DVD Blu-Ray is available but it costs $700 if not even more. Many notebook manufacturers want to use this ultimate combo but it would significantly increase the price of a notebook.
Our source confirmed that LG is among the first to have it, but we also heard that someone mentioned Samsung as well.
Instead of going for combo they have to pick a Blu-Ray or HD DVD as getting the both of them in a combo is too expensive.
The price will go down just give it some time.