I'm Ann, from the team here at Shopify :)
There sure is! Check out the Free Shipping Bar by Hextom! It lets you put a custom announcement bar on all your pages (or just select pages), and it lets you show progressive messages when customers put more items in their shopping carts.
I hope this helps! If you have any more questions or concerns feel free to reach out to us here :)
Have a great one,
there is a help in shopify to do a custom code to inform your customers on the amount they still require to spend in order to have free shipping. I am not sure if an app "should" choose the product to your customer based on price ONLY, it does not make sense, the customer should be enticed to choose products that are "related", it makes only more sense.
the article is shown on this website, you need some coding skills or to hire someone to get it done.