I was looking into those as well not too long ago. I wanted Apple Car Play and a touchscreen. The thing was, it was always so dang expensive.
As a workaround, I added Bluetooth to my Mopar head unit for less than $15. Not as sexy as a touchscreen, but I can stream music from my iPhone, which was the main reason I was looking at new stereos anyway. You can read about it here:
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=45&t=90173
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997