Physical copies of the game are scarce on the shelves.
http://www.nintendoworldreport.com/news/36519
The physical copies of the Nintendo 3DS game Rune Factory 4 are in short supply in North America.
"We've received quite a few inquiries asking about Rune Factory 4 since it's been difficult to find in stores in North America. Don't worry! It's just been selling well beyond our expectations, so we're working as quickly as possible to restock physical copies" publisher XSEED said on their official Facebook page.
Released in October, Rune Factory 4 is the final game developed by Neverland, who is also the developer of the Lufia RPG series. They closed doors in November, a month after the game was released in North America.