Cant you just get some 2x4's and either get tarps to cover or have a canvas cover made. I dont know if you are any good at sewing, but I made a cover for a boat of mine, cost me like 100 bucks for the material, I had an old cover to use as a template, but the cover I made was 100 times the quality of the first cover.
Make a nice sturdy A-frame and then cover it, there are some good tarps that you can secure to the frame. Not sure if this helps, just another idea. I think shipping on some of these products might kill you!
DJ