I have just done a check out of curiosity. The sabre 60 has a dry weight of 3.9KG add to that side pouches and packaging and I think it is fair to say around 4.5KG combined weight.
You then need insurance of at least £150 to cover the bag.
If you go to RoyalMail international shipping guides it gives £79.99 as a price for international standard.
Also keep in mind that there's also added charges if the parcel is over a certain size, the cost of packaging etc
I wouldn't say it is a rip off but would definatly recommend buying a different bag closer to home. I have used the Sabre and, although good, I have used better.
The Berghaus Vulcan is a great bag and Berghaus has an australian dealer so shipping should be cheaper:
AUSTRALIA - Distributor
Outdoor Agencies PTY Ltd
Unit 6/43
Herbert Street
Artarmon
NSW 2064
Australia
Tel: +61 2 9438 2266
Fax: +61 2 9438 2520
Also there is an Australian Karrimor dealer:
Adventure Agencies Ltd
802 Fergusson Drive,
Upper Hutt
+ 64 4528 8245
+ 64 4528 8248
www.dwights.co.nz
sales@dwights.co.nz
Even if they don't stock the SF range, I am sure they could import one over cheaper.
Hope this helps