The Memory Stick Pro Duo price has been reduced once again. It is indeed a good news for PSP gamers particularly the students community. 4GB San Memork Stick Pro Duo cost S$72 while the 8GB cost S$135. The 8GB is currently the most popular version as it allows you to put more games, videos and MP3 on your PSP. 4GB is a popular choice among the student gamers.