Exclude specific products from WooCommerce Dynamic Pricing.

woocommerce-dynamic-pricing-exclude-specific-products.php

add_filter( 'woocommerce_dynamic_pricing_process_product_discounts', 'is_product_eligible', 10, 4 );
function is_product_eligible( $eligible, $product, $discounter_name, $discounter_object ) {
  //Be sure to change this to your product(s) you want to exclude. 
	$exclude_products = array(
		320,
		401,
		100
	);

	$the_id = $product->get_id();
	if ( $product->is_type( 'variation' ) ) {
		$the_id = $product->get_parent_id();
	}

	$exclude = in_array( $the_id, $exclude_products );

	return $exclude ? false : $eligible;
}

add_filter( 'wc_dynamic_pricing_flag_is_on_sale', function ( $on_sale, $product ) {
  //Be sure to change this to your product(s) you want to exclude.
	$exclude_products = array(
		320,
		401,
		100
	);

	$the_id = $product->get_id();
	if ( $product->is_type( 'variation' ) ) {
		$the_id = $product->get_parent_id();
	}

	$exclude = in_array( $the_id, $exclude_products );
	if ( $exclude ) {
		return false;
	} else {
		return $on_sale;
	}
}, 10, 2 );