So I just bought 90 tins of cat food. All of the "Royale" varieties of Fancy Feast were 50c at Big W Phoenix Park (WA) and it's advertised as a "Drop Zone" special on their website so I presume it's available In other stores/states as well. Some of the regular/classic varieties were also 50c, as were some of the Dine Desire varieties. No special tickets on the shelves - just a matter of scanning them to find out.
Regular shelf price is $1.60 for Royale and $1.20 for Classic, and they're currently on not-so-special at Woolies for 10 tins for $11.
Did you check best before?