Been waiting for the 750ml to go half price again, unfortunately it hasn't since December last year, however this is the same price per L ($10/L), if you don't mind the larger size.
Cobram Estate is top rated on the Choice table with 85%, just above Red Island which is 79% but slightly cheaper at $8/L vs $10/L and in a smaller bottle which some might prefer going with.
I remember days when this used to be had for $24 on special not long ago (or for half price on the bottles). Good olive oil when it's on sale.