Atlus has heavily discounted a slew of their Nintendo 3DS exclusive titles on the handheld's eShop. You can check out the full list of games below.

I checked these deals on my Nintendo 3DS and was surprised to find they're not blatantly on the eShop homepage (or I at least didn't spot them at first glance). However, using the app's search bar to look up Atlus or any one of the specific games your interested will show the sale prices.

If I could make some recommendations, Radiant Historia is a remaster of one of the greatest JRPGs on the original Nintendo DS. Shin Megami Tensei: Strange Journey Redux is an absolute classic that shouldn't be missed,  The Alliance Alive is a hidden gem with a storyline written by Yoshitaka Murayama of the Suikoden series. Finally, while I've never played Persona Q it's a spinoff that has the heroes of Persona 4 and Persona 3 work with one another. I've linked reviews to each game above — happy grinding!