I think iRotor (sponsor on the right) has them, I haven't got any info from them yet, but I'm fixing to make a call.

 

iRotors should have an email towards me pretty quick, hopefully they will have a pic/price. From their site they are about 150 bucks...
Tbyrne sells powerslot I belive.. and the expensive *** (yet badass) Baer setups...

 

i've been looking into some of this...seems for us that slotted might be a better idea. seems that when you drill them it removes area of the rotor (duh) but that means there's less rotor to discipate less heat. where as the slotted clean the pad better and if you get ones with slanted and staggered vains they discipate heat MUCH better. that's just what i've come up with thus far.