...you can get that body on eBay ...but it will cost you.
However you can get the entire M05 kit w// the body for about the same price as the body is selling for on eBay. If your willing to pay $100 you can get the M05 (original) mini cooper set from Tower (assuming you use a $20off coupon + get the free shipping).
otherwise yeah, ...
Tamiya also discontinued the JCW mini cooper body -fortunately I caught wind of that and snapped up 3 extra JCW bodies for $29 each. I don't have any spare original bodies though. -never thought they'd discontinue that one.