There's a pack on Amazon called the Gambit Pack with the following cards:
4 scenarios (solo & coop cards for each of Nemesis Beast and Pirates of the Dark Star)
2 Merc Cruiser cards for the trade deck.
This seems to be a superset of what's available in promo pack 1 here on BGG. This pack has everything the BGG promo pack has, plus...
I think the stuff that's not in Promo Pack 1 will be in Promo Pack 2, which should show up on the BGG Store in a month or two. There's another thread around here about that... Here it is:http://boardgamegeek.com/thread/1162833/bgg-store-item-vs-am...
Why isn't the gambit pack listed here as an expansion?
Because nobody has added it yet? If it's available at retail, which it is, then it should be in BGG's database. You know you can add things to BGG's database yourself, right? You don't have to wait for someone else to do it. You just submit the details and then a mod will approve it in a day or two. You even get some GeekGold for your trouble.