Just realized I've been walking around with potentially valuable bills in my wallet and never even knew it. Apparently certain $2, $50, and $100 bills are worth way more than their face value if you know what to look for. Like, a 1928 series $2 bill with a red seal could fetch anywhere from $4 to $175 depending on condition. That's wild. The older the bill, the more collectors seem to care about it. A 1934 $50 bill in good shape goes for $65-75, and certain 1966 $100 bills with red seals can be worth $135-169. Even newer ones sometimes hit big money—some 2009A $100 bills with unique serial numbers are worth over $1,000. I'm not saying every bill in your pocket is a goldmine, but star notes and bills with printing errors definitely catch collector attention. Guess I need to actually look through my cash instead of just spending it. Has anyone ever found anything valuable in circulation?