Change Buy Now button to link to least expensive item in Comparison Set
When you are displaying a Comparison Set for an External/Affiliate WooCommerce product, by default, the [Buy Now] button for the WooCommerce product will link to the URL specified when the product was created.
The following code dynamically modifies the [Buy Now] URL so that it links to the cheapest item found in the Comparison Set.
Create a custom plugin
If you haven't done so already, create a custom plugin.
Add custom code
Add the following code to your custom plugin.
Save your changes
Now your products' [Buy Now] buttons should link to the cheapest product found in your Comparison Sets.