Try US Kids Golf - lightweight graphite shafts but still proper sticks. You purchase them according to height so you don't end up with something too long/short.
http://admin.uskidsgolf.com/redirect.cfm?locationID=29507&menuID=32
As for where - try this lot.
http://www.planetgolfuk.co.uk/
My lad had a set of the better players clubs (not the green shafted ones which are more for beginners) until he moved up to adult clubs and they seemed to work well.