What about making a Kayak yourself? Have a willow tree in the yard- or a friends? This link (OOPS I don't know how to insert a link) http://www.shelter-systems.com/kayak.html shows the site- they sell fasteners that are not cheap- but Home Depot sells tarp fastners for $1 each- it's ugly but very light and can me made with branches and a tarp.

John R. web page