5 lug rear disc brake rotors, just the rotors

[Mandic]

Does anyone know of a good source for 5 lug rear disc brake rotors? I already converted my front end and am looking to convert the rear. However instead of buying a disc brake kit I have individual components I already had on the shelf. Namely a set of weld on disc brackets, a pair of calipers, and lines. However I am having a hard time locating a source for a pair of slip on 5x5" 5 lug rotors. All of the front GMs I find have the hub assembly integrated and don't appear to be able to separate them. The parts I have are from an old 4x4 project where we could separate the hub and rotor to use it.

I really don't care to spend a few hundred bucks to buy someones kit when I have almost all of the parts already. I mean these companies have to be selling replacement rotors for their kits, brakes don't last forever. I just cannot seem to locate rotors only. Any help is appreciated. Searching just brought me to a lot of kit discussion or "buy a kit" statements.