You can buy them online on ebay. etc or you can get them at shops such as jb-hi-fi, ebgames,game and many other shops.
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No, PSN cards can be used only once. If are from a different region and you need a PSN card that belongs to a different region since you have a different region account then you can buy the PSN card from online
Either with a credit card or by buying PlayStation Network card from WalMart, 7-Eleven ect...and entering the code on the back of the card into PSN after signing in.
you cannot unlock them you have to buy them on PSN or LIVE Marketplace
It is illegal to do so if you have not bought a PSN card, entered the code on the back, and downloaded it through the PlayStation Store.
with a credit card or go to a store and buy a Microsoft points card.