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add_filter('b2bking_applicable_rules_products', 'b2bking_discount_rules_sale_price', 10, 5);
function b2bking_discount_rules_sale_price($results, $rule_type, $product_id, $user_id, $categories_array){
    $rules = $results[0];
    if ($rule_type == 'discount_everywhere'){
        // calculate discount percentage of rule
        $regular_price = get_post_meta($product_id,'_regular_price', true);
        $sale_price = get_post_meta($product_id,'_sale_price', true);
        if (!empty($sale_price)){
	        foreach ($rules as $index => $rule_id){
	        	$howmuch = floatval(get_post_meta($rule_id, 'b2bking_rule_howmuch', true));
	        	$discounted_rule_price = $regular_price * (100-$howmuch)/100;
	        	if ($discounted_rule_price > $sale_price){
	        		unset($rules[$index]);
	        	}
	        }
	    }
    }
    
    return array($rules, $results[1]);
}