ECS Tuning also has new Geomet Cross-Drilled/Slotted or just Slotted rotors with special coating so no rust - and they are on sale right now for good price.
They have applications for couple different models - if you're not sure what sizes you have, just email them and they will check. Sometimes even given same model - rotor sizes are year/build date specific.
I ordered a full set for my 328iX...
2009 328ix E92 Cpe//SGM//ACS Roof Spoiler//MTech Aero Lip+Trunk Spoiler//M3 Side Skirts//CF Roundels//CF Grilles//M3 Novillo Interior//Perf Shift Lever+Boot//M3 DCT Wheel//M3 GT3 eBrake Handle/Boot//ACS Pedals//M3 Mirrors//LCI Tailights//LUX H8v3 AE/MTec 6000K D1S/HPB HID 6000K Fogs//HPB LED Interior//RPI Scoops//CF Euro Airbox+Underhood Hsgs//K&N//MTech Rear Bumper/iS Sport Diffuser//MFD Strut Brace//PBX//BMW 193M's+Kumho 4X