8-3/4 or Ford 9 inch???

My main reason for even considering to go with a 9 inch is that they are much more plentiful...finding an 8-3/4 that doesnt cost an arm and a leg is almost impossible these days, and most need to thoroughly be rebuilt...dont get me wrong, i dont want anything but fine mopar *** under the rear of my car, but like i said im concerned with price and availability...are the ford's cheaper, and if so what cars would have a 9 inch posi in them that i can easily find and narrow to my needs?