That piece is a major pain! It's hard to get and rare to find. Dealerships will charge you up to $700 just for the top piece and I found a link here on the forum to a Mopar Parts site that offered the top piece for $388.
I also searched for it used through ebay - Wrote messages to every guy on ebay who offered Xfire parts by parting out a salvage vehicle - Just a week ago I found one guy selling it for $150 and the other wanted $200. If you are looking for the part it's definitely there you just have to search (unless you don't care about price and order it from Mopar or Chrysler dealership).

If you go the used route I would still make sure to use some strong epoxy to tie it down so it won't go flying again!