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USB to PS/2 Adapter for Keyboard and Mouse | Eaton
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PS2 MOUSE – Entrepix, Inc.
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USB Mouse to PS2 Adaptor -- DataPro
PS/2 to USB Keyboard and Mouse Adapter - Keyboard / mouse adapter - USB - KVM Switches | StarTech.com
Finally found one, Official PlayStation 2 USB mouse : r/gamecollecting
Amazon.com: New HP MOAFKOA 537748-001 PS/2 PS2 Optical Two Button Scroll Mouse : Electronics