try a V3 card you put money on the card then purchase whatever you like, how it works is like this you go to a any shop that provide a payzone point similar to a paypoint what you use to top up credit on your phone for example the colour is pink unlike paypoint which is yellow you then put whatever amount on the card thenoff you go. You can ask for a V3 card from www.v3.com everything you need to knopw is on there website. i have one and used it numerous time with no problems.