Spend a minimum of USD10 and enter PERKFIVE at checkout to get USD5 discount.
As per previous eBay US voucher deals, you'll need an eBay US registered account, but you can shop for eBay.com.au listed items via the US site, and ship to an Australian address. Just delete the .au from the Australian eBay address, or login to eBay using eBay.com in instead of eBay.com.au
Starts 8am PT 5th November and finishes midnight the same day. This (I think) is
2am Tuesday until 6pm of the same - Cup Day! (EDIT: Let's try 3am until 7pm, shall we?)
Current exchange rates put this at a minimum spend of ~ AUD 14 for a saving of ~ AUD 7, though this might vary slightly by the time the deal goes live.