If you’re looking to play the part of a spy at some costume party, you could always pick up one of these Spy Coins from Dereu & Sons Mfg. Co. Each coin has a hollowed out inside which allows you to fit a microSD card inside it, and once closed it’s almost indistinguishable from your regular coin. There is also a special ring bundled together to retrieve your hidden treasure. The bad news is this hollowed out nickel will set you back $30, which really seems like a bad business deal, don’t you think?