There is a minimum thickness listed in the manual. If it is under that, the manual says to replace it. I'm not going to recommend this, for obvious safety reasons, but I am running a rear rotor that does not meet the manual's specs, by just a little bit. If it was a front rotor I might be more concerned, but since there is a very light load on the rear brake anyway, and the rotor is not otherwise damaged, I just left it that way. I figure it will probably last as long as I have the bike, though I do look at it once in a while.
I checked both bikebandit.com and cheapcycleparts.com, and they show it as being no longer available new. Bikebandit does still list a price of $260. If you really believe it needs to be replaced, about all I can suggest is a cycle salvage yard, or ebay.
I checked both bikebandit.com and cheapcycleparts.com, and they show it as being no longer available new. Bikebandit does still list a price of $260. If you really believe it needs to be replaced, about all I can suggest is a cycle salvage yard, or ebay.