Westbrass 3-1/2 in. Post Style Kitchen Sink Basket Strainer in Stainless Steel (2-Pack) D2145-20 - The Home Depot
The Plumber's Choice 3-1/2 in. Strainer Basket Universal Replacement for Kitchen Sink Drains Stainless Steel with Rubber Stopper 17621 - The Home Depot
Karran QBSBL Basket Strainer 3.5-in Black Plastic Rust Resistant Strainer Basket in the Kitchen Sink Strainers & Strainer Baskets department at Lowes.com