the difficulty is that for 25quid it will not buy you a lot of choice, you’ll pretty much be stuck with a generic street set-up (double kick and small hard wheels). sizewize at this price they are all much of a muchness (maybe 30 x 7.5 or so), avoid the very small ‘back-pack’ type ones.
general skate shops that i’ve used…
http://www.kateskates.co.uk
http://www.rollersnakes.co.uk
http://www.skatewarehouse.co.uk
pricing it up quickly on ebay, i reckon i could do a decentish basic street set up, that’d be better quality by far than the argos jobbie, for 50quid.
however around here, maybe because so many of them surf, kids are drifting away from street stuff and getting more into longboards and 70’s style boards. these are far more suited to riding around on having bigger/softer wheels and trucks that turn. for basic completes maybe 60quid up.
things like this are popular,and for a 9yr old good dimensions..
http://www.rawk.com/Shop/ShopProductDetail.asp?fdShopProductId=13847
or…
http://www.skateasylum.co.uk/acatalog/mindless-longboards-sb9600-energy-blue.html
for more specialized kit, especially slalom (which would be a good lad and dad thing)…
http://www.octanesport.co.uk
http://www.apollo11shop.co.uk
the latter having some decent cheap street completes for 27quid.