Build.com offers the American Standard White Cadet Pro, model no. 4188A.104.020, in White for $68.90 with free shipping. That's the lowest total price we could find by $2. It features an EverClean porcelain surface. Note that this is just the tank, not the bowl.

A close price: Jet.com and Zoro via Rakuten Shopping both offer it for $69.49 with free shipping.