What is the value of an uncirculated US 2 dollar bill?

$2 bills have been issued since 1862 so it's not possible to give a specific answer without knowing the bill's date, series letter (if any) and seal color.

Assuming your bill is dated 1976 or later, though, it would be a standard Federal Reserve Note and would retail for maybe $3 to $4 if uncirculated. However the bills aren't rare. A dealer probably wouldn't offer much more than face value because they have all they need