Where to by concert tickets

AB ticket sales system means that people who can tend o buy as many as they are allowed, then pass them on to friends at cost. That's just how it happens.

The AB has a good policy for taking back unwanted tickets, so it's not impossible that you'll get one through the waiting list or on the door on the night, and there's a fair chance that you can find a fan outside who will dump a spare on you at cost price.