CPP has the rear e-brake calipers listed on ebay for $110 plus $18 shipping, no core (including pads)
http://cgi.ebay.com/ebaymotors/Parts...1%7C240%3A1318
And here's a link for the brackets $87.95 plus $13.59 shipping.
http://cgi.ebay.com/ebaymotors/cc-CH...mZ310109374559
And here's the rotors from R1 Concepts @ $48.40 plus $21.82 shipping (for the pair).
http://cgi.ebay.com/ebaymotors/Parts...1%7C240%3A1318
That's a total of $299.36 for rotors, pads, brackets, and calipers.
Michael