Sonic Drive-In: 50% off shakes, floats and slushes August 29

On August 29th, 2018, SONIC Drive-In is offering 50% off shakes, floats and ice cream slushes — all day. It’s the perfect time to sip one of its new limited-time Real Fruit Berry Shakes — Strawberry, Blueberry and Triple Berry.

The chain offers the same deal after 8 p.m. for the spring and summer — ends Labor Day.

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