SALE PENDING 2008 Kawasaki Jet Ski STX -15F No Trailer, Low Hours, Runs well In 2008 a part of the excitement came in the form of the Kawasaki Jet Ski STX-15F. This machine has awesome maneuverability and an affordable price tag for most any budget at just over $8,000. This personal water rocket is truly on the leading edge of affordability in the watercraft world.