Where to buy international iTunes card

I am trying to integrate my SaaS with a payment provider based in the UK. They work exclusively with iOS and I need to install their app on my iPad for development. The problem is that I can only download it from the UK Appstore and to sign up an iTunes account in the UK I need a iTunes Code. So basically, where is the best place to purchase a iTunes Code? There seem to be many sites but a lot of them look very dodgy.

Could it maybe be possible to create a user through a British proxy? :slight_smile:

eBay works fine for this.