Id file a insurance claim. Windshields are salty! Dealer or ebay is about it... Did see a few on ebay the other day but who knows if it would fit. Id rather have the dealer handle that one!
I had to replace one pane on my 2010 as the same happened while towing. I believe it was about $750. I'm sure the whole curved piece will be a little more pricey. Dealer should be able to help you locate