Перенёс поле _price для туррели

Assets/Scripts/Turret.cs

@@ -7,9 +7,12 @@ public class Turret : MonoBehaviour
     [SerializeField] private float _reloadTime = 1f;
     [SerializeField] private float _damage;
     [SerializeField] private float _distance;
+    [SerializeField] private int _price;
 
     private float _reloadTimer;
 
+    public int Price => _price;
+
     private void Update()
     {
         if (_reloadTimer >= _reloadTime)
@@ -38,4 +41,9 @@ public class Turret : MonoBehaviour
     private bool DetectEnemy(Vector3 direction) =>
         Physics.Raycast(transform.position, direction, out var hit, _bulletPrefab.Distance + _distance) &&
         hit.transform.TryGetComponent(out Enemy _);
+
+    public void OnMouseDown()
+    {
+        print("Click on turret");
+    }
 }

Assets/Scripts/TurretShopItem.cs

@@ -6,9 +6,8 @@ public struct TurretShopItem
 {
     [SerializeField] private Turret _turretPrefab;
     [SerializeField] private Sprite _icon;
-    [SerializeField] private int _price;
 
     public readonly Turret TurretPrefab => _turretPrefab;
     public readonly Sprite Icon => _icon;
-    public readonly int Price => _price;
+    public readonly int Price => _turretPrefab.Price;
 }