User Interface Kit

Okay, I dont quite understand this.

If I buy this on sellfy the price is 59.99 : Link https://sellfy.com/p/8Or2/

But if I go to the marketplace, then the price is 71.99.

Though I like it alot, and want to get my hands in it, because I need this for my current proejct, I just dont understand, why the price is so different?

What am I missing?