Since I won Terraria in a raffle a few months back, I'd been debating selling it on. Yesterday, my brother gifted me Starbound, which I believe is by the same studio, but it's a space exploration version of Terraria. Anyway, since now I'm playing that, I can give someone else Terraria that I never used.
I'll sell it below the price it is on Steam, just $6.50 (£4) and it's all yours! :3