The ice creamery chain continues its promotion strictly on the 31st day of the month.
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The one-day offer is good for one scoop of any of its 31 flavors.
Baskin-Robbins has already offered the discounted scoops in January, March and May, with the special still to come in August, October and December.
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The chain says participation varies among stores, so you'll have to check ahead with the nearest location. You'll be able to find your nearest Baskin-Robbins at this website.
Waffle cones and other toppings are extra, and the offer does not apply to sundaes.