OK here's the OFFICIAL scoop.
I just spoke to THE man, Mark Lenning. Some of us (me included) will remember him from the 7800 GTX "fiasco" when all of us wanted to upgrade our XPS Gen.2s. He was THE man to organise the correct part for us. I believe this guy 100%.
He quoted me the part number, the price etc etc, but told me that they have NO stock available to sell separately from new systems.
The warehouse has told him 2-3 weeks on availability. If you guys want to speak to his team now, you can on extension 9571118.
Also, Mark said hi to us folks on notebookforums.com (yep of course he remember us) and said to e-mail him anytime at firstname.lastname@example.org
So there you have it. Now, we wait...