There's still some copies floating around on ebay and a few other various online sources. But I did do a quick check of Amazon and I didn't find the base game, although the builder expansion is available there.
It is currently out of print, hence the difficulty tracking it down. However, I do believe a reprint is indeed in the works with the actual non-license invading title finally hitting the box front.
If you can find a decent FLGS, you may still be able to get a new copy. I was extremely lucky enough recently to purchase my copy at my FLGS. I was just casually browsing and happened to be all the way in the back of the store, in a fairly dark corner, and moved some games around that were at the front of the shelf. Behind those games, I found one lonely, somewhat dusty, copy of the game and immediately grabbed it.
Incidentally, you may want this thread moved from rules to general...