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Walmart [walmart.com] has Anpei 3-In-1 Straw Sippy Cup Comotomo Bottle Conversion Kit for $ 3.41. Shipping is free w/ Walmart+ (free trial available [walmart.com]) or on orders $ 35+.
Anpei 3-In-1 Straw Sippy Cup Comotomo Bottle Conversion Kit $3.41 + Free S&H w/ Walmart+ or on $35+