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Sonic has half price Classic and Master Shakes [sonicdrivein.com] all day to celebrate St. Patrick’s Day.
Regular prices range from ~ $ 2.49 for a mini and $ 4.59 for a large (add ~$ 0.50 to each for a Master Shake.)
Regular prices range from ~ $ 2.49 for a mini and $ 4.59 for a large (add ~$ 0.50 to each for a Master Shake.)