The item which you said says free postage

The item number you gave clearly shows the postage cost as $12.90 to me, near Sydney 

Totally stock photos just lifted from the web

Given the seller of the item is registered in China and their feedback is in the toilet, and the claim is 'reusable plastic' when it is clearly normal plastic straws shown in the photos (which are banned here anyway)

The 'postage' should be a moot point since the seller is not one anyone should be choosing to support in the first place