Silver-Storm Washable Medical Grade 1000dpi Optical Mouse with Scroll Wheel- Dishwasher Safe, Antimicrobial (PS2) (Black) | STM042P by Seal Shield from WetKeys Washable and Waterproof Keyboards
Hewlett-Packard PS2 Mouse | eBay
AquaPoint Sealed Industrial Optical Mouse (PS2) (Black) | DT-OM-PS2-BLK by iKey from WetKeys Washable and Waterproof Keyboards
Finally found one, Official PlayStation 2 USB mouse : r/gamecollecting
What is PS/2?
Amazon.com: PS-2 Optical Mouse
Amazon.com: V7 Standard Full size 3 Button PS2 Optical Mouse with Scroll Wheel for Desktop and Notebooks (M30P20-7N) - Black : Electronics