Standard JD suitcase weights are 42 and 72(?) lbs. Last time I priced about a year ago the 72 lb weights were $105 per weight in Montana and much the same price in southern Alberta. I don't know about the smaller weights. Check eBay as there are usually some weights for sale there. If your lucky and find a seller close to you then you can just pick them up and you don't have to pay the freight. Tractor wreckers, scrap metal salvage and dealers back yards are also good places to look. Expect to pay at least the price of scrap cast iron.