99% of memory sticks sold on ebay is a fake, they even sell fakes at shops(buy from a trusted shop). They would never sell a geniuine 2gb sony mem pro duo stick for less that 300au.
i got my at ebay for 100au, retail price is 500au. Its very hard to tell the differences. I threatened the ebay seller and he then gave me a life time warranty from his supplies(he had 100% positive feedback,800+ so it was easy to damage his business and he lived locally next to me) and then admited to his crime for selling unauthorized fake memory sticks.
Note: Fake ones are claimed to be unstable, they may seem real but its actually a fake.
FOR SONY pro duo memory stick
things to look out for REAL memory sticks.
*casing has rectangular seals which have been heated in not holes.
*
LEXAR and SANDISK also have fakes
more info here
http://forums.vr-zone.com/showthread.php?t=53801
be careful shopping, so far my fake memory stick is quite good.



























