“Eligible Items” means items listed at on eBay.com.au where a link to these terms and conditions and the coupon redemption code PLBFSS is found in the item listing, or the item appears in the following URL:
“Discount” means the amount saved per transaction as set out below:
Save $10 when you spend $100 - $499 in one transaction; or
Save $50 when you spend $500 - $999 in one transaction.
Save $100 when you spend $1000 or more in one transaction;
It seems the coupon code can be applied on some items that are not on the offer page. Try your luck.