I think it is $95 loss. Again, assuming the owner starts with x dollar, follow all the transactions involved with the sale, he ends up with x -14 +100 -81 -100, which is x -95 dollars.
He lost $100, the $14 that the DVD cost the store owner is an investment, not a loss. So he gave the neighboring store owner the $100 that he got from him in exchange for the counterfeit bill . But he got paid in good real money the $19 for the DVD.