Osta Internetist: UK PSN 30 GBP Kinkekaart

Only works on an UK PlayStation account

PlayStation Network Cards are a safe and convenient way of adding funds to your virtual wallet, without having to provide your credit info!
PSN Card contains a safe and unique 12-mark code you can use to receive the associated amount on your PlayStation Network Wallet. Purchase games, music, and games at your leisure and without unnecessary intermediaries. Fast, safe, and convenient.

Also check out the PS Plus membership cards, which give you the opportunity to play with friends online, get at least 2 free games every month, and enjoy a lot of other benefits:

UK PSN Plus 3-Month Subscription Code
UK PSN Plus 12-Month Subscription Code

Why should I use Playstation Network gift cards to make purchases?

Security- there is always a certain risk in entering your credit card details to a third-party page. By using a Playstation Network gift card, you do not need to enter your card details. You can simply add the credit on your account by entering a unique code.

Flexibility- you can use the credit you have added on your account whenever it is suitable for you. If you buy an item that costs less than the amount of credit you have on your account, the remaining credit can be used for future purchases.

Budget control- Using gift cards is a great way to keep your budget intact because you can limit the amount of money you want to spend. This way you will not be able to blow your budget without buying a new gift card.