Kelley Blue Book does not list boat values, but it does offer values on personal watercraft. Personal watercraft include both single-rider and multiple-rider water scooters, more popularly known as Jet Skis.
Kelley Blue Book only offers values for products in the automotive industry. Along with personal watercraft, it offers values on cars, trucks, motorcycles, ATVs and snowmobiles. It also offers price values on used cars and trucks going as far back as 1946. Most price values are found online at the Kelley Blue Book website (KBB.com), but some specialty automotive products are listed in price guides that are only available by subscription.