Upselling a Customer based on Certain Tags in their Record

I have a client who is selling a Quick Start toolkit as supplement to a book he just wrote. I have created a landing page in the back of the book for someone to go an order this toolkit. Since there are different prices for those who own the book(would have a book purchase tag) and those who don’t, what would be the best way to set up my landing page(or order form) so that I can offer a book/toolkit combo upsell for those who don’t own the book(wouldn’t have the book purchase tag). Thanks for any help you all could give me.

Hi, Micahel. Not sure how your process is set up, but can you just drive those that don’t have the book to a separate order form? I’m guessing you don’t just want to offer the book as an optional discounted upsell on the toolkit order form to avoid ticking-off those that already bought the book at full price. You could also send the non-book owners a promo code that adds the book upsell at a discounted price on the order form.