Write SQL query to solve given problem: What is the average land area of ​​the cities in which stores that purchased products for a unit price of 998.30 are located?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT AVG(T2.`Land Area`) FROM `Sales Orders` AS T1 INNER JOIN `Store Locations` AS T2 ON T2.StoreID = T1._StoreID WHERE T1.`Unit Price` = '998.30'