Westbrass COMBO PACK 3-1/2 in. Post Style Kitchen Sink Strainer and Extra-Deep Collar Disposal Flange/Stopper, Powder Coat White CO2196-50 - The Home Depot
Sink Strainer in White : Amazon.co.uk: DIY & Tools
KOHLER Duostrainer 4-in White Plastic Kitchen Sink Strainer Basket at Lowes.com