unfortunately, the dynamic pricing system is no longer available since the beginning of November due to a conflict between the site and its extension.
Instead, you will find a system called “Bundle” allowing you to freely combine previously defined products, and to benefit from a discount.
For example, for every 5 Weekly Shonen Jump purchased through the dedicated product page in the Bundle category, a 10% discount will be applied.
Visit the category from time to time to discover new Bundles.
Thank you for your understanding.