Check your local Officeworks for stock.
Various Cleanskin screen protectors and tempered glass protectors for $1 each.
While at Greenway Plaza Wetherill Park, saw a bunch of iPad Mini 4 screen protectors for $1.
Pack of 3x film protectors or pack of 1x tempered glass protector.
The OW website shows a small number of items for $1 as well, so store stock may vary.
Did you see any s8 screen protectors?