Murdoch's, the ranch and home supply store. You can buy these feed troughs at any livestock / farm supply store around your area, just call around... Much cheaper option then building one IMO.
after doing some measuring in the garage this is getting downsized. I have decided to make the pond a large triangle so I do lose so much area and the garage is still usable for myself and large enough of an area for the fish.
that will be 50'' of depth at the center point so all the fish should be able to turn around and swim with more than enough space. Please chime in if you guys think this is a bad idea.