If your interested in bearings for Century and probably any heli for a good price try Boca Bearing in Florida.
www.bocabearing.com. I looked up for the Raven and I could buy (on special) the whole lot for the heli for $100 USD.
My first crash which took out the tail gearbox I lost one bearing. That cost me $25.00 Canadian to replace 1 bearing. That crash was my fault... the engine quit and instead of letting it float down (between 1 & 2 meters) I pulled the collective to zero.
My wife has a saying for poverty. "Poverty is the mother of inventions"
Jim