For a limited time only, Sonic is offering you a FREE Medium Slush offer when you download the Sonic App (iOS or Android) and create an account! Once you create an account on the app, you’ll get the offer added to your account. It is valid through May 26th. Plus, you can still take advantage of the Half Price Ice Cream Shakes everyday after 8PM for the entire Summer! (Thanks, Easy College Coupons!)
