http://megaxport.com/lumines-psp-p-1347.html?currency=USD
I found this site selling way cheaper than I could think I'm gonna try it and tell if its legit.
http://www.amazon.com/Sony-Memory-MSX1GS-GST-Package/dp/B00076SC4S/ref=pd_bbs_4/105-5880162-3866028?ie=UTF8&s=electronics&qid=1185403665&sr=8-4
about 8 bucks
http://www.amazon.com/gp/offer-listing/B00099ZAFM/ref=dp_olp_2/105-5880162-3866028
1gb lexus memory stick for 13.00
seller electrofan2003 I just bought it so Its a good deal.
http://search.ebay.com/memory-stick-2gb_Sony-Memory-Stick_W0QQcatrefZC6QQcoactionZcompareQQcoentrypageZsearchQQcopagenumZ1QQfasiZ1QQfromZR10QQfsooZ1QQfsopZ3QQftrtZ1QQftrvZ1QQsacatZ43473QQsascsZ2QQsbrbinZtQQsbrsrtZd
they sell some cheaper.