There's nothing special about US $2s. They are just ordinary money. They are still produced and are available from just about any bank in the US.
Millions of UNC 1976 $2s are still sitting in bank vaults and regularly make their way into circulation, along with newer 1995, 2003, and 2003A series $2s.
I regularly try to obtain $2s when I visit the US. I spend them all. People's often surprised reactions make spending them fun.