I have had heaps of trouble getting kids gear. Unfortunately the importers just don't bring it in to Australia. It is expensive to freight it in, but you can order anything you want from Germany... Our industry just isn't forward looking enough and don't realise that if they don't help the kids get into the sport, it will die out (and so will their business).
Anyway, I have tried to order in advance, pay in advance and do lots of begging but they just don't budge. It's too hard... I had a set of Severne sails for my son and need to replace them. I even emailed Severne Sails directly on two occassions to ask them to send 4 sails but they didn't even bother to reply.
It is so important that beginners get the right (light) gear and totally determines whether or not they will succeed and therefore persevere with the sport. My son has just turned 8 and I have managed to teach him to windsurf in under a year (to carve gybe and jumping level). It was only because I managed to score the right equipment that it was possible. If you want to get some inspiration, I have put a short clip of him on Youtube:
The only way things will get better here is if the parents do some lobbying. They need to put pressure on their local shops to stock the gear and then the shops will speak to the importers. I also think that should only be the start. The industry and the RYA need to do much more to promote the sport. Maybe more windsurfers need to get into the RYA. It's amazing what is happening in other countries. Eg in the UK they are grooming vast numbers of kids. They have a fantastic programme where kids get together weekly and get instruction, go in comps and even get gear.
If you want some second hand gear, I have a good collection and may have something that will suit you. Contact me if you want to discuss.