I've successfully used Australia Post but their online postage calculator is misleading. Just enter the weight and dimensions as 1x1x1 and it will be more realistic. If it's not in a box they'll only go by weight and it will be around $30 - just wrap it in a black plastic garbage bag and tape it up. This is not tricking the system, if you go to the post office they'll calculate it the same way.
Otherwise, there are a few couriers online that seem to have a slightly better rate but I've never used them.
Just make sure whatever method has insurance to cover the value. Posted one kite and it never arrived and because I used cheapest track and trace option and kite value was over threshold I got nothing back to refund the buyer with. Oddly kite turned up in a lost property police auction a year later and was sold on, despite them having the serial on it in their system.
aussie post all the way. never failed. you dont need a box, put the bar in the middle of the kite and wrap in paper or plastic bag, all good. generally costs around $30 or 40 in australia
also with C.O.D (cash on delivery) with Oz post,(receiver) pays for the agreed amount for the kite at counter before picking up, (sender) receives a check other end that you send the kite from.
plastic bag via Auspost works a treat wish I knew that a long time ago, for boards use transdirect.com.au has a price comparison of different couriers and usually door-to-door.
whatever you don't use e-go they are s***te and usually double-dip on your credit card.