The best discount code for Gazelle.com as of now is a $20 off sitewide when you sign up to emails. There's also a $25 off discount code for orders over $500. For military and medical workers, there's a 5% off discount code available. First responders can also get an extra 5% off. Please note that these codes are subject to change and it's always a good idea to check the website for the most current deals. Remember to apply the discount code at checkout to take advantage of these savings. Enjoy shopping!