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Amazon [amazon.com] has Dunkirk (4K Ultra HD) [4K UHD] for $11.02. Shipping is free w/ Prime or on $35+.

Walmart [walmart.com] has Dunkirk (4K Ultra HD + Blu-ray) on sale for $11.02. Shipping is free w/ Walmart+ (free 30-day trial [walmart.com]) or on orders of $35+.