Your search for "pwr-ms420-400ac-r" revealed the following:

NEW Cisco Meraki PWR-MS420-400AC-R 400W AC Front-to-Back Switch Power Supply

SKU: NSN-8234
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Cisco Meraki PWR-MS420-400AC-R 400W AC Front-to-Back Airflow Switch Power Supply

SKU: NSB-6981
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days