First post, be gentle-ish. :)
I've been after one of these, and it's the lowest price according to the camels - recently $449.92, but more typically ranges between $250-$350. Seems to be a bigger range of these products on the market now but the Triton has a good reputation.
"The iconic Triton SuperJaws can be easily transported right to the job, whether indoors, outdoors or to the workshop floor. SuperJaws provides fast, hands-free clamping of material up to 955mm (0-37 1/2"), and a massive clamping force of up to 1000kg (2200 ft. lbs), enabled by the foot-operated clamping mechanism. Constructed from tough, powder-coated steel, SuperJaws will hold anything - from car parts and bicycles to timber and tubing. Features include a lock / release switch for fast release of the workpiece, and reversible jaws for extra-wide clamping capacity. The new and improved fame and leg design, allows for better stability and setting up and folding down in seconds. The new and improved design can sustain a work piece of up to 200Kg (440 lbs.), all while providing a 360-degree access to the workpiece."
Looks like the price has gone back up.