Bet this thread didn't turn out the way you expected huh devil crab
unfortunately, much as we are all obsessive about diving, dry suits cost a fortune. Frankly, there is no way I'd pay money for a new suit for a lad that was still growing.
That being sais, you might have more luck getting him to agree to a badget and seeing if you can pick one up off ebay or second hand somewhere.
Good luck