Yay! Sonic will be offering 1/2 priced-shakes all day long tomorrow, December 22nd! Visit Sonic’s Facebook Page for details! A great time to try their Oreo Peanut Butter Shake, Coconut Cream Pie Shake, or Strawberry Cheesecake Shake.Yay! Sonic will be offering 1/2 priced-shakes all day long tomorrow, December 22nd! Visit Sonic’s Facebook Page for details! A great time to try their Oreo Peanut Butter Shake, Coconut Cream Pie Shake, or Strawberry Cheesecake Shake.