Instead, wait for an eShop sale. Winter sports compilations are frequently discounted by 50–75% during actual winter (December–February). Set a price alert on DekuDeals and grab the game legitimately for under $15.
An NSP file is a type of file that is used to distribute games on the Nintendo Switch console. NSP stands for "Nintendo Submission Package," and it is a container file that includes all of the necessary data to install and play a game on the Switch. Winter Games Collection Switch NSP Free Download
Use a method suitable for your setup (like a computer or directly from a source) to transfer the NSP file to your Switch. Instead, wait for an eShop sale