How much is 1878 S Morgan Silver Dollar worth?

a little over silver value in low grades (less than ef) (15-16 dollars), at AU its value is around 30 dollars (but it's really tough to find it at this price at this grade at coins shops because at MS60 its value gets closer to 55-60 dollars making it very collectible, once those MS graded ones become more rare the AU55 grade will increase in value by a lot.) So at unc. or close to unc. it would be best to keep it or only sell it for 35 or more dollars. At lower grades it should be worth 18-20 dollars.