I am not sure what they retail for in the US, but a company I build equipment for makes these up here in Canada, retail them for $399.99 at Canadian Tire for a 72"x15' mat. Three layers of foam, 2 pcs 5/8" with a piece of 4lb foam that's 1/4" thick in the center for added strength. I have 2 of them and one I paid full retail for them and one was a freebie, my kids have a blast on them at the time I was questioning the $$$$$$ but we have had it for three seasons and still perfect. We did a few experiments when we first started building them, actually parked 2 seadoos on one without a problem.
Brian