Redirect Purchase Button to External Site

Site URL: https://www.jakenaughton.com/books/this-is-how-the-heart-beats

Hi all. I have a commerce site with a few books for sale. Two of the three are fulfilled by myself, but for the third, payment, shipping, etc. are handled by a third party. I want to showcase the book in the "books" section of my site, but have the Purchase button redirect to the vendor's page where all of that will be handled. Any idea how to make this happen?

Thanks!

Hi

I am also trying to achieve the same thing with my store. I sell some art through my own site but also sell exclusively through a third party online store so would like my BUY NOW button to link to that site.  Can anyone help us both?

Thanks