This is Region Free, which means it will play on any BluRay player, even in the US. That includes your precious PS3.
The price shows up as £17.99. But when you select a US shipping address, UK-specific VAT tax will be removed. That drops the price to £15.31.
Standard shipping across the pond is only £3.08. (sorry, your US Prime membership won't help you here.)
The total is £18.39 which currently comes out to US$29.08! (The website will do the conversion for you and give you your total in USD, so you don't have to go looking for a converter.)