The local salvage/junk yard, Maybe Autozone, Pepboys, Advanced Auto parts, Napa, Carquest, O'Reillys & last resort, the Kia/Hyundai dealership.
Can try another non Kia/Hyundai dealership when you take the body panel clip/retainer.
Ebay, Amazon.
ordered from Ebay. Since I'm always working/fixing cars.