Beno or Cdan can get them with a mud discount. Used ones are often in the parting out section, or a local pik and pull. They're easilly rebuilt. Instructions are on MUD, and there are youtube video's on the process as well.
Got a hack job on the drivers side. I am replacing all the rotors, calipers, pads so I figured while I am in there I will replace the hubs as well so its fresh. I currently have the Aisin hubs. But I think only the passenger side is serviceable