You can hide the micro-SD cards inside some of the coins sold by spy-coins.com (they're also sold by ThinkGeek). Only downside I've noticed is that when you dr

You can hide the micro-SD cards inside some of the coins sold by spy-coins.com (they're also sold by ThinkGeek). Only downside I've noticed is that when you drop one of the coins onto a hard surface it doesn't sound right - the "ring" it makes is different. But if you have it in with a handful of legit coins, it passes without notice. Just don't spend it by accident. ;)