Your search for "a900-pwr1200-a" revealed the following:
Cisco A900-PWR1200-A ASR 900 Series 1200W AC Router Power Supply
SKU: NSH-8574
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 881.99
• Only 2 remaining
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Cisco A900-PWR1200-D ASR 900 Series 1200W DC Router Power Supply
SKU: NSH-7113
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days