I read that the cost over seas was in the $120US range for the same size tub. I bought the box from WM. I like the ease of application and removal, the looks, and the beading action it gives. I have only had a layer on the car for about 3 weeks, so I dont have any info on durability.
Search for AUTOGLYM HD on you-tube, you will see some of the water sheating and beading vids.