Which products by Plutzer Lebensmittelgromrkte AG were discontinued and what are their price?
products refers to ProductName; 'Plutzer Lebensmittelgromrkte AG' is a CompanyName; price refers to UnitPrice; 
discontinued products refers to discontinued = 1
SELECT T1.UnitPrice FROM Products AS T1 INNER JOIN Suppliers AS T2 ON T1.SupplierID = T2.SupplierID WHERE T2.CompanyName = 'Plutzer Lebensmittelgromrkte AG' AND T1.Discontinued = 1