What they didn't mention is that there are only two GSO retailers in Australia, Bintel is one and Andrews Commnications is the other. Bintel puts a Bintel sticker on them while Andrews sells them as GSOs. I would suggest you call Andrews as when I was buying my 12" dob a few months back they were significantly cheaper than Bintel. They also offered some differences in their stock like larger altitude knobs, and black bases.
Here is their website:
http://www.andrewscom.com.au/site-section-10.htm
Note: This post has been edited since originally posted to provide the link.