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Amazon [amazon.com] has Back to the Future: 40th Anniversary Trilogy (4K UHD + Blu-ray + Digital) for $29.99.
Shipping is free with Prime or on $35+ orders.

GRUV Entertainment via Walmart [walmart.com] also has Back to the Future: The 40th Anniversary Trilogy (4K Ultra HD + Blu-ray + Digital 4K) on sale for $29.99. Shipping is free w/ Walmart+ (30-day trial for $1 [walmart.com]) or on orders of $35+.