I didn't want to leave this hanging. My original source doesn't really have a good deal on RBH anymore, but I did find another source.
http://stores.ebay.com/HiFiTraderOnline
They also sell on Agon. I saw a few negative comments about these guys on another forum, but I have to say I have nothing bad to say about them. Shipping was fast, prices were good, and service was pleasant. I won a pair of MC-6 inwalls for $149 and a matching MC-616 for $99. I received the MC-6's yesterday and they were well packed and in mint condition. They did ship the wrong center speaker to me; they sent the MC-616C. No big deal really as they're already correcting the issue and it's completely understandable. I could have said nothing as I think the MC-616C is worth more anyways. I don't think they have anymore RBH stuff ATM, but keep an eye on them as they have some good deals.
So I now basically have a 5.1 RBH MC Series inwall system for around $530. This includes the dual 8" inwall passive sub. Can't beat that!