eBay are having another sale with fairly narrow parameters, but that doesn’t mean you can’t find some LEGO on sale.
The specific offer is 20% off at selected sellers when you click and collect. To take advantage of the offer you will need to use the code PICK20UP. I have heard mixed reports about whether you actually need to select the click & collect option or not.
Having a look through the offer the only LEGO seller seems to be Hobby Warehouse. They have a fairly extensive range but be aware that some items are priced above RRP.
This offer runs until 23.59 (AEDT) on October 9th 2017.
Edit: I originally had the code wrong.