Perhaps the last place most people would think to look, Spy Coins hide tiny things in plain sight in the form of genuine legal tender. Each Spy Coin is precision machined from an actual coin of one of various currencies and is indistinguishable from its unmodified brethren to the naked eye thanks to perfectly aligning seams — though they’re a bit lighter. They’ve got enough room in their chamber for a tiny folded up note, a poisoned needle (ideal if you judge your risk of capture to be high, likely a bad idea otherwise), or a micro SD card (fits in all coins except the US quarter, which is unfortunately too thin). While the chances one is uncovered by a layman is slim, the bigger worry will be to not accidentally spend them.
Learn more at Spy Coins – $21+