I found a CL ad for this Canadian five piece kayak that comes in bags that you can fit in the back seat of your car.
Just curious as I have not seen much chatter about this option…
Looks similar to the Pakayak, which has 6 pieces that nest together. I saw one of those (Pakayak) at Mountain Man Outfitters paddlesports shop in Saratoga Springs, NY, when I was up there last month. Their shop is right on the dock of Fish Creek and you can test paddle any of their boats in stock right there.
http://www.mountainmanoutdoors.com/pakayak-packable-kayaks.html