The BD drive is only $100 on ebay.
This place has it for about $90 shipped, but they have some bulk discounts. I'm guessing it wouldn't apply for shipping to multiple...
I got an Arc Mini recently, though I knew the R2 was coming out. From what I can tell, the R2 is a little bit bigger and adds a window and 360mm rad support. If size is important and 360mm rad support is not, an R1 is still a good case.