What is the biggest size for a PSP memory Stick Duo and what is the cheapest I can get it for?

I got a PSP from my brother an when I personalized it, I could barely add anything so I'm gonna buy a bigger memory stick. Can someone help me out?

US $12.50 (1 Bid)
End Date: Wednesday May-23-2012 11:50:57 PDT
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{ 3 comments… read them below or add one }

Erika May 10, 2011 at 1:04 pm: hmm I think its a 16gb
and you can get those on ebay
for like $30 Im pretty sure.:)…….
wayne May 10, 2011 at 1:27 pm: http://www.pspmod.com/forums/psp-news/35367-64-gb-storage-psp-possible-via-photofast-card-adapter.html
Marc May 10, 2011 at 2:12 pm: I have a 2 gb memory sick ( i think ) and it cost me 50 dollars it may be 20 gb but i doubt it.