98 Ford Explorer Disc brake complete
(rotors, calipers, backing plate, and brake mounts) = $40 at junk yard. I found this complete new looking so I took them and they have been working fine. No other modifications needed for my 94 XJ. I used the rubicon bearing retainer plate. All you have to do is re-drill the Ford brake mounts and the rubicon retainer plate. All in all I spent about $50 bucks.
I think right now with all these clunckers around you can surly fine a good set.