Amazon offers Prime members the Final Fantasy XIV Online Realm Reborn and Heavensward Bundle for PlayStation 4 or Windows for $14.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $4.98.) That's the lowest total price we could find for this bundle on either platform by $15.

Update: Note that the PlayStation 4 version is temporarily out of stock, but can still be ordered at this price for delivery when available.