Not all US BluRay players can play PAL content. So while you will be able to watch the movie without any problems, any special features that are not in HD will be in the PAL SD format.
OP lists Call of Duty 4 for Xbox 360 at $30. Looking at the add it should be $40 for the PS3 and 360 versions. The PC version is $30. Which is already what they are priced at, these dropped last week.
Also, the ad lists the PC version of Terminator 4 at $50 not $60 as stated in the OP.