what to buy a 9yr old boy for less than or about £10?

[starbaby]

My best friends son is 9 and i need to get him a present. Unfortunately, he appears to be VERY hard to please. Every time I give him a present he always looks pretty dissapointed. It drives me mad! Last year, he even made a sarcastic comment about my present not being very big!!!
(his mother wasn't in room at time)

Any ideas? Maybe I should just give him the money but don't want my friend to think I haven't made an effort and he's only 9!!

Trading cards? pokemon, yu gi oh, football cards
Bakugan?
A fivers worth of gogos - crazy bones things?

Lego set or one of the new lego games? Meccano also do some small vehicle building sets.

Gormiti
Transformers
Practical joke kit
Lego set (although I think those Lego board games are around £15)
Music CD (ie, Now something-something)
Voucher or cash (which does not look much, but they seem to really like

this hours of fun for everyone

Fun fro everyone except the cat.

A lesson in gratefulness?

A book

GIVE IM CASH

Read title as, "Want to buy a 9 year old for less than a tenner" and came to offer sympathy for the crappy day you must be having

Mangostickyrice- I did the same thing!