Got to be new? Theres 3 on eBay right now. EBR rotors come in 5mm and 6mm. Either will bolt on fine and won't make a difference on the street. I would HIGHLY recommend the EBR race hardware kit. Have you tried calling EBR directly?
If you can't get it from them, Galfer, EBC, and BraKING, all have rotors available that don't seem to get any complaints. Stay away from the cheap ones. I'd rock a beat up used OE one before I went cheap/new one.