Ceramic Ball Bearings

[sleepy23]

Ok, basically i need to know a couple of things here:
1. how much do you guys typically spend for ceramic ball bearings
2. ceramics are lighter i know, are the more concentric also?
3 can anyone with ceramics weight them versus a steel bearing of the same size so i can see the weight savings?

I ask all this cuz i am thinking of putting them in my racing transmissions but i really want to see the savings versus costs.
thanks