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Amazon [amazon.com] has TL Care Supreme Fitted Crib Sheet (Gray, 28" x 52") for $ 4.33. Shipping is free w/ Prime or on $ 35+.
Walmart [walmart.com] also has TL Care Supreme Fitted Crib Sheet (Gray, 28" x 52") for $ 4.33. Shipping is free w/ Walmart+ (free trial available [walmart.com]) or on orders $ 35+.