Akicon Copper Kitchen Sink Stopper Replacement for 3-1/2 Inch Standard Strainer Drain in the Sink Drains & Stoppers department at Lowes.com
KONE Copper Kitchen Sink Strainer Basket, Stainless Steel Antique Copper Sink Strainer and Stopper Replacement for Standard 3-1/2 inch AC Sink Drain, with Metal Center Knob and Rubber Drain Stopper - Amazon.com
3-1/2" Kitchen Sink Basket Strainers - Antique Copper - Set of Two | Signature Hardware