Amazon UK has the Harry Potter - Complete 8-Film Collection 4K UHD +Blu-ray 2017 Region Free collection for £79.99. If you live in the United States the price drops to £69.74 after postage and Packaging.
Which according to google is 97.35 USD expect a slight difference depending on your bank or foreign exchange fees.
This set is current $151.46 on Amazon and similar or higher prices everywhere else.
Current amazon listing for reference.