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Amazon [amazon.com] has 16-Oz General Mills Monster Mash Marshmallow Breakfast Cereal for $ 2.14. Shipping is free w/ Prime or on $ 25+ or $ 35+ orders (minimum requirement varies by location).
16-Oz General Mills Monster Mash Marshmallow Breakfast Cereal $2.14 w/ S&S + Free Shipping w/ Prime or on $35+