Amazon.com: JUZHUO Original 32GB Memory Stick Pro Duo (MARK2) Memory Stick for Sony PSP/Camera Memory Card : Electronics
How to Update Your PSP Firmware
Amazon.com: PSP Memory Stick Adapter, Funturbo Micro SD to Memory Stick PRO Duo MagicGate Card for Sony Playstation Portable, Camera, Handycam : Electronics
Best Buy: Sony PSP Memory Stick Duo PSP-M32
Memory stick takes about ten minutes to load : r/PSP
Memory Stick Micro SD Adapter for PSP | Hand Held Legend
System Update
Amazon.com: PSP Memory Stick Adapter, Funturbo Micro SD to Memory Stick PRO Duo MagicGate Card for Sony Playstation Portable, Camera, Handycam : Electronics
PSP Preloaded Memory Stick | eBay
Sony PSP Memory Stick Duo (PSP-M32) 32MB - Walmart.com
Memory Stick Micro SD Adapter for PSP | Hand Held Legend