there's a lot of seller in the net in Malaysia, even in this forum.. how do you guys know if the Oakleys they are selling are the real deal and not some AAA knock off?

rather disappointed with Oakley Malaysia. the range they have is so limited. the authorised dealer said the particular model i am looking for is discontinued but when i checked the oakley USA website it is still sold. tried contacting Luxottica but they havent reply to me.. wonder if any body know of trustworthy grey importer?