I would first off make sure that when you buy it, it has the *real* MotS.
Aside from that, I could only find Amazon or eBay. I found 4 US auctions on eBay, with varying inclusions and pricing (and shipping - one person wanted $8.25!)
It is hard to find - why isn't it at LucasArts?!?! I look whenever I'm at EBGames or GameStop or Best Buy, but they all just have the regular JK.
Dopelar effect (n.) The tendency of stupid ideas to seem smarter when they come at you rapidly.