Hey Bill, I'm personally not looking for one, friend of mine wants one, and was telling me of the prices he's found.
Around here, an enclosed 6x12 ramp door trailer will run you 3500 min. And at that, its not road legal. 3500lb rating in OH, law says it must have brakes, but they don't come with a brake axle. I've seen 10,000 lb rated goosenecks for sale here new ($7500) and not the first brake axle on it. You're not legal to drive it off the lot, but folks do anyway. Here, brake axles are required by law, but considered an option by trailer manufactures. I don't see how they get away with selling them, myself.
-Ralph