Devil Survivor originally came out on Nintendo DS (in 2009), and it received an enhanced port on Nintendo 3DS (in 2011): Devil Survivor Overclocked. Unfortunately, it’s pretty hard for Japanese players to find a brand new copy at the regular price nowadays, since the game has been out of print for quite a while already.
Good news: it’s getting an Atlus Best Collection release on December 3rd in Japan, which will cost 2 980 Yen (+ taxes). Of course, this is just a budget re-release, and this version doesn’t include any bonuses whatsoever. Also, it’s extremely unlikely Atlus will tease anything on the official website, like they did for Shin Megami Tensei IV.
Here’s the boxart for Devil Survivor Overclocked – Atlus Best Collection: