I don't believe that any of the current US $2 notes can be described as rare. They are about as scarce as 70's, 80's and 90's Canadian 50 cent coins. They just don't circulate. The tellers at US banks are incredibly nice and, if on a car trip to the US, you may wish visit some banks to enquire if they have any $2 notes. You're guaranteed to receive a "thank you" at the very least and possibly a "tootsie roll".
The notes are good movers if you have a "flea market" table (or equivalent), i.s., your opinion as to scarcity is fairly common.