Appears to be almost site wide apart from a few excluded sellers and usual category exclusion, no minimum spend. Bit unclear on who is an "eligible customer" though but sure we'll know soon enough in the comments if its targeted.
Conditions. The offer entitles eligible customers to $5 off the purchase price (excluding postage costs) on all items listed on ebay.com.au except the ‘Excluded Items’. A maximum of 1 transaction applies. Multiple items may be purchased in one transaction (up to a maximum of 10 items per transaction). All monetary amounts specified in these terms and conditions are in Australian dollars (AUD).
'Excluded Items' means; all items listed in the following categories;
All items listed in the following categories: (88433) Other; (130) Tickets; (123416) Other Tickets, Travel; (9800) Cars, Bikes, Boats; (3252) Travel; (3253) Flights; (183477) Vintage Luggage & Travel Accs; (10542) Real Estate; (316) Services; (11116) Coins; (184609) Gift Cards & Vouchers; and All items sold from the below sellers; Coles Supermarkets BCF AMR Lenovo Officeworks Myer