Your search for "c3kx-pwr-350wac" revealed the following:
Cisco C3KX-PWR-350WAC Catalyst 3750X Series 350W AC Switch Power Supply
SKU: NSH-1394
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 29.99
• Only 2 remaining
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NEW Cisco C3KX-PWR-350WAC Catalyst 3750X Series 350W AC Switch Power Supply
SKU: NSN-4371
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 139.99
• Only 1 remaining
Call if you need more