Hi. I haven't used a handheld since gameboy. Bought a 3ds recently and want to play games on it through the r4. I'm not sure what exact card i need. I'm happy just playing the older DS games (and not the 3ds ones). I don't know any site that sell them (That are 100% trust worthy). preferably I'd like to use paypal, but i could use a card if i know the site is secure. I live in the UK if that's of any importance. Thanks!