Yes, there are several ways to get a deal on Tether Tools products. One can create a customer account on their website to receive periodic emails alerting to sales and new products. Buying a kit is another option as they are already discounted. There are also promo codes available that offer up to 10% off sitewide. However, these codes are subject to certain terms and conditions. For instance, some promo codes only apply to orders that contain certain products or reach a price threshold. If a promo code is not working, it could be because it is no longer valid or doesn't exist in their system. In such cases, it is recommended to contact the person or organization who provided the promo code. Please note that these details are subject to change and it's always best to check the official website for the most accurate and up-to-date information.