custom fab would prlly be your cheapest/best option man. Those pipes are friggin expensive for what they are. Just find a good reputable exhaust shop in the area and they should have you something fabbed up for cheaper than you can get any thing RB would have however if you are still set on getting pre-fab. You could try calling Goodwin Racing and seeing if you can buy a roadstersport midpipe, Just another option to RB. Those are the two that i know of.
-Jeremy