> Still nothing has been sent, and he has had 50% of the money. ...but you have a contract that presumably sets out the delivery, and how you resolve disputes,

> Still nothing has been sent, and he has had 50% of the money. ...but you have a contract that presumably sets out the delivery, and how you resolve disputes, and what happens if somebody delivers late, presumably. And if you don't have a contract...well, there's a lesson there!