i picked up a older jogging stroller from CL for 15 bucks. it was one of the older versions with 20" tires and a lot of metal tubing and brackets to work with. it's not the prettiest cart on the beach- but it works at less than a third the cost.
a hacksaw/sawsall, drill gun, rivet gun, ballpine (sp?) hammer, a couple of hours and motivation was all it took to convert it into a very useful addition to the arsenal. i think i'll lower the rails a bit so that the center of gravity of the kayak sits lower for travelling over more severe obstacles. i use a ratchet strap to secure the boat to it.
here's a photo of the side:
i flattened out some tubing and attached it for supports to eliminate lateral sway.
it was nice to have some of the brackets already in place to use.
