While not as good as the site-wide deals, you can dig out some decent stuff from eBay's selected store discounts. Starting from 4pm today, you'll be able to save 20 per cent off purchases from a large number of eBay sellers -- all you need is the right coupon code.
Spotted by OzBargain user undefined (not a mistake, their handle is literally "undefined"), the deal requires entering the following coupon code (which will become valid from 4pm today until September 20):
Sadly, it'll only work for selected stores, a full list of which can be found on eBay's terms and conditions page for the offer. Speaking of conditions, the code will work for up to three transactions, with the maximum discount limited to $1000 for each.
If you can't be bothered hunting through the list of participating stores -- no problem. Willy Orwontee over at OzBargain has crafted a handy search URL to do the work for you.
Some advice: be on the lookout for cheeky markups that counter the benefits of the discount. The easiest way to check is via Google Shopping, or your price comparison site of choice.