I got mine from summit racing, it is their brand and all galvanized coated, very good kit,everything fit perfect and the price I think around $400 They also have 4" and 6".
Put a post up in the site vendor's area, I'll bet one of those fine folks can help you out for cheaper than you think, DPPI is one that comes to mind. PM user Mark Craig, he has given CompD discounts before.