The $1 Slushy promotion is available only on Tuesday 2nd, 9th, 16th, 23th February 2016. Offer is valid for one medium sized Slushy or Fizzy Slushy at stores which have the Helova Frozone kiosk. Limit one per person
$1 Medium Slushies Every Tuesday in February @ Night 'n Day
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iirc both McDonalds and Burger King have $1 Large frozen cokes available right now too(every day)