Big W must be doing away with physical media in the same way KMart did a few years ago. I was in the Blacktown NSW store and most Blu Rays, DVDs and 4Ks were in piles out the front with prices of either $4, $8 or $15. Sadly new releases such as ghostbusters afterlife and also likely Spider-Man no way home were or will probably be at the RRP as I price checked ghostbusters afterlife 4K and it came up as $35. One would assume they will stop ordering in new movies in due course also.
Still 1917 4K for $8 was a steal but sad to see the Demise of physical thanks to the likes of Amazon prime and Netflix. If anyone else can confirm if there local Big W has the same sale feel free to comment.