Sorry, but I don't think you'll get any people who have 1D tickets they "don't need" or want to give away... If they bought them, I'm sure they'll want to keep them since they're pretty expensive to begin with.
If you're planning on buying a ticket if you don't have any luck and if you're concerned on price, I would advise you to buy a "medium" ticket, like not a floor ticket or one that's too far away in the nose-bleed section. There you'll be able to see and hear your boys just fine and have a fun time. Good luck! :)
