Do what I did - I started with a standard friction bar sway control. Quickly ditched that and used a dual cam. Then, I watched craigslist within 400 miles LIKE A HAWK.
Eventually, I found a HA for 450. Yes, 450. $50 in parts and she was on the road. A year later, found another for on $200. Put about 200 in parts in that one and got my dad set up with it. Sold my DC setup and recouped some of that money.
Found another for a friend of mine, but he had to give a bit more - 800. However, no parts had to be bought, and he had some extras including cover and all. If you get a used one, don't forget to factor in the cost of a new stinger should you need. In my dad's case, we took his stinger to a machine shop and had then change the drop from 8" to 2". Needs to be done by a certified welder, of course. That was cheaper than doing the exchange route with HA. The PP has an adjustable stinger so no worries there.
Just saw one recently for 1500. A bit overpriced. You should be able to find a HA or PP in the 800 or less range. I would not pay more than 800 for one.
