CompUSA store that is a block away from me has this sale going on.
$49.99 for a SanDisk 4GB Memory Stick Pro Duo
http://www.compusa.com/products/product_info.asp?pfp=SEARCH&Ntt=SanDisk+GB+Memory+Stick+Pro&N=0&Dx=mode+matchall&Nty=1&D=SanDisk+GB+Memory+Stick+Pro&Ntk=All&product_code=341229
$49.99 for a SanDisk 4GB Memory Stick Pro Duo
http://www.compusa.com/products/product_info.asp?pfp=SEARCH&Ntt=SanDisk+GB+Memory+Stick+Pro&N=0&Dx=mode+matchall&Nty=1&D=SanDisk+GB+Memory+Stick+Pro&Ntk=All&product_code=341229