Your search for "PWR-C49E-300AC" revealed the following:
Cisco PWR-C49E-300AC-F Catalyst 4900 Series 300W AC Switch Power Supply
SKU: NSH-2576
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 90 days
$ 146.99
• Only 2 remaining
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Cisco PWR-C49E-300AC-R Catalyst 4900 300W AC Front-to-Back Airflow Power Supply
SKU: NSH-3657
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days