Keeney Plumber's Spec 3.5-in Stainless Steel Rust Resistant Strainer with Lock Mount Included in the Kitchen Sink Strainers & Strainer Baskets department at Lowes.com
Kitchen Sink Strainer, 2-Pack Sink Strainer Basket with Handle, 4.5" Diameter, Stainless Steel, Rust Free and Dishwasher Safe - Amazon.com