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Bluray at $55.99 is cheaoest it's been since the start of September where it was $42.50 (https://www.ozbargain.com.au/node/562711).
4K UHD version is also available for $108.50 and includes the Blurays - Harry Potter: 8 Film Coll BD 4K UHD eSR - https://www.amazon.com.au/dp/B077687MVW/
4K price lowest ever according to 3xCamel - Just be aware the special features arent on the 4K discs according to reviews.