$2 bills aren’t rare at all. You can walk into your local bank and get a stack of them anytime, if you’d like.
Meanwhile, in my 25 years of living in the US (NJ, SoCal, and NorCal), I can count on one hand the number of times I've come across them "in the wild".
I started collecting them in 2004 by keeping every one I ran into in person and I now have: 3.