... use code:

DEALS10

Code is said to be targeted but there are reports that it will work for those not targeted (also check eBay summary to see if eligible as it will appear at the top under the "Vouchers" heading).

Limit 1 transactions per person during the Offer Period. A minimum spend of $75 per transaction applies. The total discount is capped at $500 per transaction.

T&Cs:

https://pages2.ebay.com.au/Buyer_coupons/deals10