Has anyone in the US bought larger items from them (ex: seat pans, foam, etc.)? Is there any customs due? I've never bought anything outside of North America so I'm not sure how that works. I don't think I'm going to have much luck with the seat pan I need so I may end up buying one of their seat pans. For the $76 it's going to cost me for the pan and shipping, I don't want to be left with a nasty customs surprise when I get it.