Kohler Toilet Seat (Antimicrobial) – Costco Sale! by Rhonda March 3, 2023 6/4/21. © Frugal Hotspot *SALE UPDATE* 3/3/23. This Kohler Toilet Seat from Costco takes clean to the next level with an antimicrobial agent that protects the toilet seat from odor-causing… 0 FacebookTwitterPinterestEmail