A magic memory stick is just a normal memory stick used for the purpose of unlocking or unbricking a PSP. By normal memory stick, we mean basically any pro duo memory stick, like this:

16GB Magic Memory Stick

16GB Magic Memory Stick

This memory stick will work with any PSP, and magic memory stick is just a nickname used to refer to how this memory can be used to unlock or unbrick a psp. If you wish to buy a magic memory stick, visit BuyPandoraPSP.com.