The Sosi X-pipe seems to be the cheapest one I can find, delivered to Oz. I've seen a Remus version on ebay, but that also looks like a H-pipe?
.: 2010 E71 X6M - stock, daily driver, towcar :.
.: 2008 E92 M3 - 6MT, Carbon Roof, Eibach Springs, Megan Axle Back exhaust :.
.: 1997 E36 323i Frankenstein - too much to list, track whore, stripped, caged, MoTeC, S85B50 :.