Your search for "C4KX-FAN" revealed the following:
Cisco C4KX-FAN-R Catalyst 4500-X Series Front-to-Back Airflow Switch Fan
SKU: NSB-5843
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 29.99
• Only 2 remaining
Call if you need more
Cisco WS-C4500X-40X-ES 40x 10GB SFP+ Front-to-Back Airflow Switch
SKU: NSH-4668
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 223.99
• 11 in stock
Call if you need more
Cisco WS-C4500X-24X-IPB 24x 10GB SFP+ Front-to-Back Airflow Switch
SKU: NSH-3139
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 214.99
• Only 2 remaining
Call if you need more
Cisco C4KX-FAN-F Catalyst 4500-X Series Back-to-Front Cooling Switch Fan
SKU: NSH-7066
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco C4KX-FAN-F Catalyst 4500-X Series Back-to-Front Cooling Switch Fan
SKU: NSN-6200
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco C4KX-FAN-R Catalyst 4500-X Series Front-to-Back Airflow Switch Fan
SKU: NSN-9095
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco WS-C4500X-24X-IPB 24x 10GB SFP+ Front-to-Back Airflow Switch
SKU: NSN-1761
Condition: New
Shipping: Overnight Options
Warranty: 365 days