Search directly for The Legend of ZELDA BRSTH OF THE WILD, or search for Zelda on a certain treasure. But these two situations are different.
First, if you want to buy the digital version in eshop, just search for this name, The Legend of ZELDA BRSTH OF THE WILD.
Second, if you want to buy the cassette version from a physical store, just search for Zelda on a certain store. Hope it helps.
This story describes the demon king Ganon who wants to collect the Triforce to destroy the world. Under the entrustment of Princess Zelda, her wet nurse Impa handed over the important task to a young man named Link. Link's mission is to collect the Triforce and defeat Ganon. It's a very simple game by today's standards, but it was very advanced at the time. The data comes from Baidu Encyclopedia.