Odd it's still full price locally, as it's currently 90% off on the US store which requires a US account.
If you don't have one, sign up to a US account online (via web browser), then make a new console profile on the Switch itself and link the two together. Then, open the eShop with the new US account and purchase from there.
Games purchased from other regions (like the US) will work for all accounts on the console, meaning saves and the whatnot will work fine.
Some of the other SMG games are heavily reduced too
Super One More Jump and OTTTD are both under $1USD