UMTUU2 is the code they offer for $100 off of accessories, but you need to buy some accessories with your bike. We just had a Bike+ delivered and I used a code with my order no problem.
Every Peloton member has their own unique code and if you use one the referrer gets $100 credit for Peloton clothes. If you have a friend or family member who owns a Peloton you may want to start there Congratulations!