There's slalom (SL) and giant slalom (GS) skis for the respective events, each with their own turn radius. You'll also need race plate compatible bindings. That said, if he's on a team I would ask coaches first as they best know his abilities and if he would benefit from race specific skis. Some kids don't really need true race skis until they're 8/9 others when they're 5.
If hes on a team, it's usually a best idea to put together a 503c and do group purchase towards the end of season..
Bindings - Evo 9 or Z11 Freeflex
Ski - RC4 WC or Pro, Redster J2 or Head WCR e.SL Rebels or GS Pro Rebels - Juniors
They arent cheap - $599ish
If you let me know what you like I can get you a price - they may not arrive until sometime in Nov though.
As you know best prices will best if you put in the order around March/April. Thats usually 40-45% off. Right now back of envelope it's probs about a 30% discount.
"I've lived through some terrible things in my life, some of which have actually happened."
Mark Twain