Sonic Drive In: Medium Slushes $.79 All Day {6/24} 06/24/2015 By MFA Leave a Comment This post may contain affiliate links, please see my disclosure policy. All medium slushes are $.79 today at Sonic. The limit is 4 and you need to mention the offer when ordering. Add-ins are extra. Click here to learn more. **Sonic offers half price shakes all summer after 8pm.
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