Which store in Arizona has the most net profit?
"Arizona" is the name of State; most net profit = Max(Subtract( Unit Price, Unit Cost))
SELECT T2.StoreID FROM `Sales Orders` AS T1 INNER JOIN `Store Locations` AS T2 ON T2.StoreID = T1._StoreID WHERE T2.State = 'Arizona' ORDER BY T1.`Unit Price` - T1.`Unit Cost` DESC LIMIT 1