Reply to Contact Trouble and ordering

Hi there I msg'd you guys a while ago and sent some querys through to you but have had no reply. Basically I was asking a few things

1. Living in Australia how much will postage cost me and what will the Customs tax/ fees be?
2. Also can i get an extended warranty?
3. In case it needs repair will I have to pay and send it back to you guys in the states or do you have an authorised reparier in Australia that i send it to?

O looking at buying one of your S4 packages, sorry forgot about that.