Aust post release a "Post Charges" booklet every 6 months. It is FREE and full of information and pricing is up to date.

Takes a while to get through it all but we find it an absolute necessity in our workroom. Has a lot of info that we don't use, but worth getting from your local PO.

Released March and October in line with the new updates and increases (never a drop-sob sob) in prices.  

We also use calculated shipping and the system automatically calculates and prices for any international shipping. We only send to selected countries approx 8 and this keeps our life a bit simpler.