Through May 2nd, Sonic is offering a $1 Soft Pretzel Twist + Cheese Dipping Sauce for just $1 when you order online or through the Sonic iOS or Android app. Regularly $1.99. Valid for one-time use per user. Just open the app and select ‘redeem’ and the item will automatically be added to your order. It can also be located under the Rewards section of the app.