Unfortunately, Product Upsell isn't capable of offering products that are a lower value than the triggering product. The app is specifically designed to function based on the triggers that are set when you create the offer. Any product that you select to offer will be unconditionally offered when the offer is triggered.
Blog Posts:
- Introducing "True Upsells" for Shopify
- Problem Solved: Creating upsell BOGO offers on Shopify
- How to use cross-sells and upsells to increase revenue on Shopify
- 9 upselling techniques to explode your average order value
- How to create simple upsells on Shopify
- Why upsells AFTER checkout on Shopify will be your highest converting click