I am planning on buying a non-running 9n myself. A nieghbor pushed it out to the road a couple weeks ago. He said it "ran when parked", 2 years ago. While it was running, he replaced the clutch and changed all the fluids. 3 of the 4 tires & rims are good. One of the rears is loaded and has some corrosion around the stem, the other rear is not loaded and has a new rim.
My first tractor was a 1951 8n, which I still own (picture below). I like using it with its original Dearborn 2 x 12" plow, and for planting corn with my JD 246 planter. i bought it from the widow of its first owner, with only 1200 hours on it. It has always been stored inside, and still wears the original paint. One of the original, loaded rear rims rusted thru this year, right after I finished my spring plowing.
My plan for the non-runner is to take the loaded rear off and put it on my 8n. I will use it for cultivating this year and for plowing next spring. Over the winter, I will spend about $ 200 on a new rear rim and tube. I will also get the 9n running. I dont believe that will take much effort
The guy is asking $ 1200, but hasn't had any action on it. I plan on offering him $ 900 and not s penny more. When and if I get it running, I will put the two marginal loaded rear tires/rims on it and try selling it for $1500.
The $400 profit ought to cover my pain and suffering, breaking loose all them rusty 5/8 carriage bolts that hold the back wheels on. With two new, rear unloaded rims, my 2000 hour 8n ought to last me another 40 years or so.