If you're comfortable using a middleman, I've had good experience with ticket.st (formerly ticket.jp). You're buying directly from people who have the tickets, so you're not paying extra to cover the cut that the reseller shop would normally take.
This is the shortcut for Kuu's page. Just click on the date you want and it will show you the tickets that people are selling. I think they're all 'blind buys' at this point since I don't believe FC members who won the lottery have received their tickets yet.