Purchase replacement plastic lids for Pyrex containers directly from the company's website. Several other retailers offer Pyrex plastic lids as well, including World Kitchen and Classic Kitchens and More.
The Pyrex website offers plastic lids for round, square and rectangular containers in a number of different colors. Each lid fits a specific container, so customers must know the exact size of their product before ordering. At World Kitchen, customers can find many of the same products in addition to plastic lids for other brands of containers. Classic Kitchens and More sells packs of replacement lids for Pyrex products and plastic lids that are microwave safe.