Yes, you can purchase PS Plus with PS Store cards. Once you redeem the code(s) in PS Store, it adds them to your store wallet. You can purchase anything in the store with credit from your wallet including games, movies, shows, dlc's, PS Plus. If you have multiple PS cards then you can redeem each code and it just adds to the total in your store wallet. This is a great alternate if you prefer not to add credit card info to your PS account.