Seed seed drill

I am looking for a precision corn seed drill in good working order that will fit on a Masey Ferguson 240 . A vintage or old seed sower is fine. The simpler the better! Does anyone know where to find one? I have been looking in vain for a few months. I've checked Done Deal and local machinery auctions,  but want to purchase from a reliable source than can show me how to use it and I want to be sure it works properly.  Any leads welcomed! I have a small farm in Laois. Thanks.