Are some of the weight he's selling GT weights?
Maybe you can get him to add them to the deal.
Misc. Tractor Weights - $100
Those are all too big for a garden tractor. The round weights are for the rear ao a Farmall Cub and are too big for a Cub Cadet. They would fit something with a 24" rear wheel. The half round weights are split weights fro the back of a 400-450 and so on.