Dispose of by deception, as in They tried to pawn off a rebuilt computer as new. This expression may have originated as a corruption of palm off, although it was also put as pawn upon in the 1700s, when it originated.
To get rid of or dispose of something deceptively by misrepresenting its true value: The clerk tried to pawn off the fake gemstone as a diamond. They almost pawned the counterfeit bills off on unsuspecting tourists.