Yes, Instagram Shopping is completely free to use. All you need to get started is a Facebook business page and an Instagram business profile (both of which are free) and connect the two.
What happens after 10k followers on Instagram?
Once you have 10k followers, Instagram will make it easier for you to get people to your website via Stories with the swipe up to link feature. Swipe up is the only way to get a direct link from your Instagram to your other web properties. And, it’s available in STORIES, if you have 10k followers.