My soon to be seven year old son got a tub of Jaw Bones last year and they have been a surprise hit. I got a fairly small tub as I was half expecting them to end up just scattered all over the floor and then trodden on ignored, but he loves them, and my 9 and 11 year olds (DS and DD) have been known to have a play with them too.
I got them on Amazon this time last year - they were available from other places but Amazon were the cheapest, especially since they were delivered, and I am planning on getting him a bigger set this year to go with last year's.
He has actually liked them enough to look after them and keep them in their tub and played with them loads so they have turned out to be great value (taken as spend per play so to speak) 