Your search for "c4kx-pwr-750dc" revealed the following:
Cisco C4KX-PWR-750DC-R Catalyst 4500X 750W DC Switch Power Supply
SKU: NSB-3330
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 699.99
• 10 in stock
Call if you need more
Cisco C4KX-PWR-750DC-F Catalyst 4500-X 750W DC B-F Switch Power Supply
SKU: NSH-7046
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco C4KX-PWR-750DC-R Catalyst 4500X 750W DC Switch Power Supply
SKU: NSN-1505
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco C4KX-PWR-750DC-F Catalyst 4500X 750W DC Switch Power Supply
SKU: NSN-4962
Condition: New
Shipping: Overnight Options
Warranty: 365 days