Lordear Porcelain vanity sink White Ceramic Undermount Rectangular Modern Bathroom Sink (20-in x 16-in) in the Bathroom Sinks department at Lowes.com
Moen White Vitreous China Undermount Sink, 23.625 X 14.75 X 7 Inch Rectangle Bathroom Sink with a High Gloss Porcelain Finish for Vanity Countertop Placement, BGCW10RU1223 - Amazon.com
Plaisir 21.5" Rectangle Undermount Bathroom Sink – Swiss Madison - well made forever