Get a free medium Red Bull Slush with any app purchase at Sonic through June 28 . To get this deal, download the Sonic app and click “redeem” on the coupon before placing your order. Then choose a Sonic location for pickup. Both the regular Red Bull Slush and the Red Bull Summer Edition Watermelon Slush qualify for this offer. There’s a limit of one free Slush per person.
Note that this offer is not available when using third-party delivery services.