http://www.customs.gov.au/site/page.cfm?u=5549
That link should hopefully help with any duties and what you need to pay.
As for shops Optcorp (
www.optcorp.com) seem to have some of the better prices i've seen from the US sites and a good rep with people here, there's been a thread on them just recently.
Whether its a good idea?
Meade US seem to be harder to deal with when it comes to warranty than aussie dealers. If you have no probs you're laughing, but if you do
Been strongly looking at doing the same myself so would love to know if it works out for you if you go ahead.