When I bought my land, one of my goals was to create a food plot. I had read about it, saw them on TV, but didn't have any experience on it. I read allot of posts on here, but still didn't know what to do. I had a box blade with rippers, so I tried that for breaking up the soil. It did accomplish something, but not really what I wanted.
I saw disks for sale that I wanted, but thought were too much money to spend, so I watched the classifeds for them. Ebay, Craigslist and the American Classifieds for my area. It didn't take long to see one for sale at a fair price, but by the time I called, it was already sold. This happened several times, but after a few months, I found a nice 5ft, angle iron, 3pt disk with greasable bearings for $300 not too far from here.
Since buying that disk, I've seen dozens and dozens of them for sale over the course of a year. Prices vary, but so does quality. Mine is a cheapy that I think is worth what I paid for it. A bigger one, or one that is made from square tubing would be worth more and also allot nicer. Mine gets the job done twice a year when I do my food plot.
Not knowing what it will take to get the disk you are talking about in working condition, I'd probably pass and just wait for one in working condition to come up at a reasonable price. If I really wanted one right away, I would start going to the auctions. But auctions are funny, you really have to know what it's worth and not pay more then you know it's worth.
Good luck,
Eddie