Officially, the cartridges stopped production around the same date the digital version was "taken down". It just sold exactly as poorly as every other retrogaming/nostalgia cash grab remake, and I say that as someone that bought it and has preordered the Advance Wars remakes. The only reason you can still find cartridges of the 3D remakes is that third party sellers (amazon, gamestop etc) still have tons of stock of it.