Standard Postage: 

Fast Dispatch with in 1 Business days from Sydney

Australia post increase their price of postage with signature. it is calculated Automatically by Australia post and ebay integrated system. 

sending without signature on delivery gives opportunity to delivery person to throw parcel where ever they like resulting item getting lost or stolen.

International Standard postage : Usually its lot faster but Standard Time needed by Australia post is

USA UK CANADA : 2-3 weeks

Rest of Europe and Asia : 3-4 weeks