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Amazon UK has a great deal on 3D Blu-rays, select are available for 9 GBP when you buy 2. Listing a few titles here. There is shipping but no tax, so kinda evens out.

Ant-Man and the Wasp [2018] [amazon.co.uk]
Thor Ragnarok BD [2017] [Region Free] [amazon.co.uk]
Guardians of the Galaxy Vol. 2 [amazon.co.uk]