Wanting both cash and another tractor I feel is asking a little to much. One or the other would be a better deal.
Does it have 28's, 32, or 34 inch tires? 28s are pretty common, 32 and 34 less so. Should have 7 bolt hubs if it has 28 or 32.
I know of a running decent 20 that just sold for around 1k$ But it needed work.