Amazon UK tends to offer very good pricing for blurays compared to their US counterparts, and many of them are region-free, so can be imported without worrying about compatibility issues.
(Direct link: https://www.amazon.co.uk/Star-
The price might first appear higher on the listing because it includes European VAT. If you use US billing and shipping info during checkout it’ll lower the price to remove it. Amazon can even do the currency conversion for you, in case your credit card has international transaction fees.
But if you have a credit card, like the Chase Sapphire Preferred, without foreign transaction fees, you can do it directly in pounds.
(Hat tip to my friend Matt!)