PLASKOLITE 24 in. x 48 in. White Egg Crate Lighting Louver (5-Pack) LP2448EGG-5 - The Home Depot
Drop Ceiling Light Diffuser Egg Crate Style 24"x48"
KastLite Egg Crate Panel 3-Pack in White | Polystyrene | Nominal 2' x 4' with 1/2" x 1/2" x 3/8" Cell Size | Manufactured by American Louver - Walmart.com