Today (June 18), Sonic is offering half price Sonic shakes all day! What a great way to celebrate summer! If you visit Sonic’s Facebook page, you can get more information about this exciting Sonic shake special today! Sonic offers a variety of shake flavors including chocolate, caramel, hot fudge, peanut butter, pineapple, fresh banana, strawberry, and vanilla. Or, you could opt for a master Sonic shake with mix-ins such as peanut butter fudge, strawberry banana, strawberry cheesecake, coconut cream pie, banana cream pie, cheesecake, Oreo peanut butter, Oreo chocolate, or Oreo cheesecake. YUM. Hurry, the offer for half price Sonic shakes is TODAY only!