I spotted this place on my last bike trip, they are an Australian/Thai company that make Bike and Car trailers. They are of high quality and would be the first ones I have seen with DISC brakes. Dont know the prices but if you go to this site you can look at the Pics and talk to them. They will deliver to you.
http://carrymoretrailers.com/index.html
http://carrymoretrailers.com/index.html