How can you get sold out One Direction tickets?
Scalpers ... but expect to pay a lot more for 'em. I'm sure your parents won't mind.
1) if they are sold out, you can't get them.
There's always some on the radio... Or maybe on eBay?
Unless you are willing to go the illegal route, since they are sold out, by definition, there are no tickets to get.
Go back in time and buy them before they get sold out.
E bay's a good place to start. Scalpers could work too