I found the 4-pack Ultimate Bounty yesterday. I got mine at TRU. Nice set. Even though I have all of these in triplicate from their carded versions it was still worth it, if even just for Aura Sing's speederbike! That thing is awesome!
I got lucky finding this since it had been stuffed behind all of the other Imperial 4-packs. (Glad I check behind stuff)
One MAJOR thing I noticed was that Aura does not have her "antenna" sticking out of her head in the 4-pack. It's completely missing!