If you are looking for a Kingston USB stick you can buy one in any of your local supermarkets. Also they are not normally very expensive to buy either.
There are many electronic and hardware stores which sell 4GB USB Kingston memory sticks. An example would be Best Buy. With the proliferation of USB 2.0 and 3.0, memory sticks can be commonly found.
According to Best Buy different brands of an 8GB flash drive include: SanDisk. Verbatim, PNY, Kingston Technology, Marvel, HP, EP Memory, Action Sport Drives, and Lexar.
You can buy it here Amazon
You buy a bigger memory stick
I don't think you can. I would just buy the 4GB memory stick.
Kingston is the best brand of flash drive. There is a big range of different flash drives available and many different websites from where you can buy your flash drive but you should buy it from www.amazon.com.
you should be able to use your old memory stick in order to download music
All psp games can be used with a memory stick. The memory stick saves your progress on your games. You can buy a memory stick from wal-mart for about 10 or 20 dollars.
It is possible to purchase 4GB memory stick pro duos from Amazon. There are different brands of memory stick available such as Sony, Lexar and Sandisk.
No. You have to have a memory stick, but if you buy a PSP bundle, they usually include a memory stick.
You have to buy a memory stick.