Unless you’re getting yourself into Edward Snowden territory, we can’t quite figure out when you would need something like the Spy Coins. Still, it’s cool to know they exist and if you want to add some imaginary pizzazz to your life, we suppose there’s not harm in using them. What they do is pretty obvious: there’s a hollowed-out center in which you can easily stuff a MicroSD card. You can also easily lose a MicroSD card by accidentally using one of these to pay instead of a regular coin, so be careful. They’re about $30 each.