Have you found something for sale in the classifieds or any type of newspaper ad? Did they ask you to pay for the item through a wire transfer or a money order/prepaid card? This is a SCAM. It is not safe to send a cash form of payment, like wire transfer, money order or prepaid card to purchase an item from a stranger. And never go alone to purchase a cash only item from a stranger. Always check references and meet in a public location.