This site has good prices on new and used books. Best of all, the shipping worldwide is only a little over $3 AUD. Sometimes works out cheaper than Dymocks and Borders, even with shipping.
Use coupon code BWEVENT0708
to get 20% off books, expires 30 June.
(Edited by scotty — add coupon code, thanks to parta in the comments)
have bought stuff from there guys in the fast. excellent price for books/shipping. shipping times is a bit slow though.