Postage: FREE regular post, $12 express post.
Postage includes all costs like eBay fees on postage, postage cost from Aussie Post (I don't send enough packages to get a discount like other sellers), packaging (no source for boxes in my town so I have to travel 150km to Adelaide to stock up) and petrol to get to the post office (I live in the country).
I post within 1 business day of payment, some times I can post out the same day, some sellers can take a week to post your item.
I have no control over the postage times displayed by eBay nor the time Australia Post takes to get your item to you.