How much is my 1981 twenty dollar bill worth?

I have a 1981 twenty dollar bill. It has a a "B" with a circle around it saying Federal Reserve New York and Bank of New York. The serial number is B82362269C. It has two signatures on it; the first being: Katherine Davalos (?) Ortega as the Treasurer of the United States and the other is Donald T Regan as the Secretary of the Treasury. This bill is in excellent condition (in my opinion at least). It has been circulated. Only has 3 folds in it, but not much wear around them. No rips or anything like that.