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There are quite a few websites that may claim to have free psn code generators however when you try using them, you will realize that they do not actually work. What this should mean to you is that, you will need to work harder to identify genuine websites such as http://www.stillnsync.com/free-psn-codes-psn-codes-generator-100-working/ who provide good psn codes that would be perfect for your use.
If you have a friend or a family member who may have a better idea on getting these codes, they may be able to help you better. However, in some cases, they would simply not be in a position to help in which case, you are going to have to be doing your own research.
It is not a very tough thing to carry your own research out because all that you would be required to do is make use of a popular search engine and get started with your search. You will be able to get what you want in no time.