Hi Corey. When I was looking at them a few years ago, a new one was in the $1000-$1200 range, depending on finish and such. I don't recall there being any price difference between light double action and single action. Magazines are just under $50 ea. (new)
As you are probably aware, Para's don't have a stellar reputation - although, mine has never given me any problems. Assuming it's in nice shape and has been "looked after", I wouldn't expect to pay much less than $700 for the lot - and I wouldn't go over $800, unless you really wanted it and it's been hardly used. I bought mine from a buddy, who wanted to move on to something else. It was lightly used and in nice shape, with 2 mags - $600. Depends on how bad he wants to sell it - and you want to buy it.