They are easy enough to make if you are a woodworker (mine is home-made and works well: even for my 25x100's), or even using square steel tubing, and there are a lot of designs out there...
nev don't worry -his Eng is just not that great, i ordered the smaller one from them, only took about 6 bus days i reckon -i think mine came with fedex, for $99 its the small one, but a bargain with thr free post, weighs a couple of kilos