Sorry to throw another spanner in the works guys
I have also bought a number of products from the USA and Canada. Remember to keep the value under $500 Aus including postage.
The range of products available out of Canada is possibly not quite as extensive as those from the USA but some products are cheaper from Canada than the USA because there is no inward duty on optical goods into Canada whereas there is into the USA.
Two Canadian dealers I have dealt with are Joe O'Neil at O'Neil Photo and Telescope and Kendricks
http://www.oneilphoto.on.ca/
http://www.kendrickastro.com/astro/index.html
Kendricks have a pretty good range including Pentax and Televue eyepieces.
CS-John B