You can "Quick Buy" any pre-pub from the search results page, but can't do it from the product description page. The latter requires two steps to order a pre-pub. Please make the experience the same regardless of which place you want to order it from. Thanks!
Suggestion here to vote for:
https://feedback.faithlife.com/boards/logos-com-website/posts/please-add-a-quick-buy-button-to-pre-pub-product-description-pages
