Ubuntu Cards for buying Apps on Software Center and Music Store

It's an important suggestiom...

With the Mac App Store, some important developers will port they apps for PC platforms, and Rovio is looking at ubuntu and it software center, to put angry birds on it
But, they will not trust on it, if there's difficult to buy something, will be possible, to do a comercial pruppose?
Something like iTunes cards
Cards with 15/20/50 €/$/¥ to buy apps/music without a credit card......

For example, young people without a credit card can't buy an app, for example, World Of Goo, if I can't have a credit card, I can't buy it, but I can buy a "Ubuntu Card" to use it with my ubuntu one account, and buy music, and apps
I think we can get better support, and MORE BUYERS, if we can get this...

Please report this to the canonical and software-center team...

Thanks....