I want to spend about £25
His mother unhelpfully says 'anything' is fine. He has no ideas this year. What do I get? 
He's got some interests in music though I wouldn't be able to pick anything for him as his taste is teenage obscure. Picking clothes would also make me anxious too. Mostly likes spending time with his friends and finds it rather hard to say what else he enjoys doing! I've bought books in the past and might manage this again but would prefer a better idea. Last year was money as he was saving up for an iPod.
His parents are quite wealthy and he always has lots and lots of presents which adds to my difficulty in finding something he doesn't already have.
I'm really struggling to come up with any ideas.
Any suggestions please!