I believe this is the cheapest this game has been for a physical copy for us in Australia. The game originally got a very limited print run and was only released in Japan and North America where the RRP was $29.99 USD.

Since then, scalpers were flogging this title for upwards of $80-$100.

Despite this being the cheapest physical release, if digital is your thing the game is currently $14.99 on the Nintendo eShop which is the cheapest it's ever been there as well.