Take a drive on the back roads in the country sometime and look for the older 4-foot round Primestar dishes. Primestar has been out of business for years, so if you see one, it is almost certainly not being used, and if you know on the door and ask nicely or leave a polite note if no one's home, sometimes the owner will just give you the dish, or sell it for ten bucks. If you can actually find one in good shape, those are better than any you can buy. You have to look for them because often bushes or trees have grown in front of them; it has been that long since the service was active!