best help I can give ya ....Was in Grices gun shop several days ago. ( biggest wholesaler in W. Pennsylvania ) They have 3" SPs for $537 , thats new. They had one 3" model used for $399.99. Of course thats plus tax and fees. The used one seems like a very good price at 400. Sorry no 2" were available new or used.
Check out Guns America , Good reference for what the guns are selling for. Gun Broker too , if your a member and can see what the actual selling price is.