Just picked up a 9 foot International Disc for $100. It's old and not pretty but the price was right.
$100 clams? Not bad for these days.
It's nothing but a harrow. Are you going to use it maintain roadways or weight it up try to scratch some ground?
Hope it has greasable bearings.............they save lives and money in the end.
How will you raise and lower it for the turns or are you planning on adding a cylinder and tires?
IH makes good discs, I have one and it has made my IH plow just about obsolete, does a good job of working up the ground. It is a heavy brute and makes my 145 hp tractor work hard pulling it.