There are several salvage yards in the midwest that do sell complete older tractors. There is a big one just on the north side of the interstate from where I live, Colfax tractor parts. They sell parts or complete tractors just about any brand, size, running or non running depending on how much you want to get involved with. They do tend to have a lot of John Deeres but I have seen other brands. Tractorhouse.com is a website to maybe look at and see what size and type you would be interested. I myself have a Case 530 diesel ag tractor on my to restore list, first farm tractor I ever drove so a lot of sentimental value.