"Display discounts upfront; prevent overselling with real stock tracking."
Most volume discount apps hide the offer until checkout, so shoppers never get a reason to add one more. Most bundle apps keep their own stock count, which drifts until you oversell. Bundlo shows every tier as a selectable card on the product page, and expands bundles into their components in checkout so Shopify deducts real stock. Rules run as native Shopify Functions and take one of your 25 discount slots, however many you build. Analytics, mix and match and A/B testing are in every plan.
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