http://www.driveshaftspecialist.com/
Click on import section then Kia They sell rebuilt drive shafts,U-joints and carrier bearings.
$28,95 is close to a parts store price for a u-joint.
http://www.ebay.com/ Search kia sorento U-joints or carrier bearing.
http://www.amazon.com/ Search Kia Sorento U-joint Note not all are the same check for your vehicle.