I had this happen. Sent a deposit via paypal and the seller claimed that since the money wasn't in their bank account yet it didn't count. Then wanted to wait 2 weeks to refund me. Turns out they used the paypal from their business and I threatened a BBB report and they took care of it on the spot.
Quoted from Barakawins1:Best thing to do is send a deposit with the seller so they don't back out