I think the plowmen might have collections, and may be willing to sell, or maybe, contact a farm museum and they might be able to give you a possible source.
what is the type of those horses and what about the price of one of theme, and what is the economic way to buy this animal wish caractise must be on it like the age ,,,,,?
These horses are generally known as Heavy Horses, although you can see there are ponies and mules also participating, and in later years a team of oxen. The black horses are Percherons, the golden colored horses are Belgians, and the Clydesdales are the brown horses with the long hair (called feathering) on their legs. If you google them you could see if there are any in you area, and find out what the cost, the age, their experience might be.