This Website Link for the Nintendo Eshop Sales of Atlus games going on now till October 5th. Other companies like Square Enix are also having sales.
Other Atlus series such as Etrian Odyssey games and much more are also on sale.
To do a price comparison of two of the games on sale, here’s what SMTIV and SMTIV: Apocalypse are on sale for in the Eshop:
Keep in mind the prices for SMTIV and SMTIV: Apocalypse right now on Amazon: