Poke around craigslist. I picked up a fully brand new top from a 2013 a couple years ago for $400. It was the premium material. This is the time of year as well, as people either switch to their hardtop and don't want to store them, or are pulling christmas stuff out and realize that they didn't use it all summer, so why hold onto it.
Aim for a 2011 or newer. The changes made to the top after 2010 are so nice. It will require all new stuff, as the door surrounds are different as well, but not having to mess around with that plastic channel thing into the door surrounds for the top is amazing.
As long as you get all the parts, there any year JK will fit any JK softop. This is also a good reason for not getting aftermarket tops, they eventually stop making the windows.
edit: Of course it will require all new stuff, you don't have an OEM top. Which is bestop btw.