The deal is only valid on Sonic's Classic Shakes and Master Shakes, according to the Sonic mobile app. You can order up all sorts of delicious shakes like the Oreo Cheesecake Shake or the Peanut ...

The Yellow Cake Batter Classic Shake is made of 100% real ice cream blended with yellow cake batter, and the Oreo Yellow Cake Batter Master Shake is the same recipe with Oreo cookie pieces mixed in.

The OREO Big Scoop Cheesecake Sundae starts at $3.99, while the Blast starts at $4.99 for a medium*.

Tis the season to celebrate and Sonic Drive-In is putting a spin on a traditional holiday classic with the Holiday Mint Master Shake and Master Blast. This holiday dessert favorite will add to Sonic’s ...