X360 version is stated as region free in the website.
PS3: http://www.play-asia.com/Spec_Ops_Line/paOS-13-71-bp-49-en-70-4k22.html
X360:http://www.play-asia.com/Spec_Ops_Line/paOS-13-71-dw-49-en-70-4k21.html
Other games:
Armored Core V (US version) for $23.90 + $3.90 shipping for both X360 and PS3
PS3: http://www.play-asia.com/Armored_Core_V/paOS-13-71-bp-49-en-70-461o.html
X360: http://www.play-asia.com/Armored_Core_V/paOS-13-71-dh-49-en-70-461p.html
PS3: http://www.play-asia.com/Spec_Ops_Line/paOS-13-71-bp-49-en-70-4k22.html
X360:http://www.play-asia.com/Spec_Ops_Line/paOS-13-71-dw-49-en-70-4k21.html
Other games:
Armored Core V (US version) for $23.90 + $3.90 shipping for both X360 and PS3
PS3: http://www.play-asia.com/Armored_Core_V/paOS-13-71-bp-49-en-70-461o.html
X360: http://www.play-asia.com/Armored_Core_V/paOS-13-71-dh-49-en-70-461p.html