I just finished watching season 2 on regular DVD from Netflix (the only disc format they carry for this show), and OMG! Four-clone dance party! Are you kidding me?! I watched the making-of featurette on how they did it afterwards, and I'm still amazed. There was also a great making-of featurette on the Rachel/Sarah smack down from earlier in season 2 (when Sarah pistol whips Rachel in her office). I don't remember being so amazed at the time I originally watched that scene, only because I had totally forgotten it was the same actress. The creators joked how for next season they want to do a five-clone dinner party, which would be much harder to do than the dancing.
I don't currently carry the channel package that includes BBC America (it would add $10 to my cable bill), but I may have to re-evaluate come next spring.
Regardless, I'd like to thank everyone again who recommended this incredible show a few pages back in this thread.