hi raymo,
i had a look online and the cheapest i could manage it was $76.04AUD to Australia. that was through amazon, i clicked on the 10 new then it was about the third or four store down - it mentions international rates on the right hand side.
there are a few good online tips which are free.
here's a couple to get started.
http://www.astronomyphotos.com/PhotoshopTechniques1.htm
http://sharmaastronet.ipage.com/PS1.pdf
cheers,
Rusty