Title says it all.
Available at Best Buy and Gamestop. Sold out at Amazon, Target, and everywhere else.
I presume this is a very limited supply, as I doubt the Big N is reprinting a Fire Emblem game on a console that's essentially been running on fumes for the last year.
Best Buy Link (UPDATE 7/20/16 - Came back in stock - last place to get it)
Gamestop Link (OOS)
A very fun game - especially for those who love the quirky Japanese RPGs.