GameStop offers Final Fantasy XIV: Heavensward for Playstation 4 or Windows for $9.99. Choose in-store pickup to dodge the $4.99 shipping fee. (Amazon charges the same price with free shipping via Prime; Fry's has the PS4 version for the same price via pickup.) That's $3 under our June mention and the lowest price we could find now by $10. It requires a copy of Final Fantasy XIV: A Realm Reborn to play.
Of note, it's also available bundled with A Realm Reborn for $5 more, as listed yesterday.