NachaLuva
Product Developer
Yeah awesome vid. Very well put together...plus some great fun on the dunes! 

Firstly - is there a way to quote multiple people into the one post? so sorry for posting multiple times like this.
The icon next to the 'quote' button will allow you to double quote, then you select each comment you want then hit the normal 'quote' button when you have selected all the ones you want.
Taza
Hey mate there is another group order running on these from ozfoz.com.au. A member called lolzer organizing. $100 cheap and they're good for the price. Like 3-4mm alum
Batteries are expensive, but well worth it as with most things you are always gonna need at least 2 if you plan on leaving a charging source for any length of time.
Ratbag and Ricker - If you're in need of extra GoPro batteries, check out a brand called Wasabi Power. I recently purchased a combo package with two GoPro batteries and a travel charger (120V and 220V, US and Euro plug) for US$20! At that price having a collection of batteries is a no-brainer.
Amazon.com: Wasabi Power Battery and Charger Kit for GoPro AHDBT-001 and GoPro HD HERO, HERO2 Cameras: Camera & Photo
Looks like the price has gone up over the past two weeks. But I figure it's still a very good value if you can get them locally in Oz and/or shipped over from the US.