I remember being a kid, and my grandma giving me a $2 bill in the envelope and thinking how cool it was. Unfortunately I spent them all, without knowing that someday they could possibly be worth so much money! Certain $2 bills can actually be worth $4500 according to the U.S Currency Auctions (USCA) website. The first $2 was printed in 1862 and is still in circulation today. Supposedly if you have a $2 bill printed before 1976 it more than likely has great value. The year and condition does matter, but lets just say, if you have one just hold on to it.
More info about it all here!