The Plumber's Choice 2-1/4 in. Bathroom Sink Drain Strainer Basket Replacement for Utility, Laundry, RV, and Lavatory Sinks Chrome 2PPBS - The Home Depot
MOEN 3 1/2- in. Stainless Steel Basket Strainer with Drain Assembly in Satin 22037 - The Home Depot
Kitchen Sink Strainers & Strainer Baskets at Lowes.com