To the best of my Knowledge Andrews is not an authorised dealer for some product lines including Celestron - but this is not necessarily a bad thing. Australian Celestron pricing dropped some months back in response (I imagine) to competition from Andrews, who I think has their own independent source for Celestron products. So Andrews could be viewed as the good guys bringing competition to monopolistic Celestron pricing in Australia.
Andrews and Bintel are the two main rivals; I've purchased from both shops and had good service from both. I've also been happy with Sirius Optics and Star Optics.
I haven't purchased from
www.theastroguy.com.au but they're worth checking for prices too.
I'd recommend that you purchase locally if the price is just a little more - the convenience of being able to return to the shop for warranty service or advice is worth a hundred bucks or so.