New Horizons currently costs $59.99, in line with other mainline Nintendo Switch games. There is also additional paid content in the form of a home-designing game called Happy Home Paradise, that is available for $24.99. While this may seem expensive, I have only heard good reviews of the game, which makes me think it's well worth it!

Bells are the main currency of Animal Crossing. Obviously, you can't pay for the game with them