You can source a used Carbon Leather trim kit for $300 from the forums, $395 for one taken off a brand new car.
I wouldn't compromise on the CF roof though, every time I wash the car it just makes me smile...
2010 E70 X5M | Black | Black | Stock for now.
2008 E90 M3 | Interlagos Blue | Speed Cloth | Sold
2011 E92 M3 ZCP | Space Grey | Black | Sold