Your search for "c3kx-fan-23cfm" revealed the following:
Cisco C3KX-FAN-23CFM Catalyst 3750X Series Switch Fan
SKU: NSH-4631
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 43.99
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NEW Cisco C3KX-FAN-23CFM Catalyst 3750X Series Switch Fan
SKU: NSN-1523
Condition: New
Shipping: Overnight Options
Warranty: 365 days