Your search for "PWR-2900AC" revealed the following:

Arista PWR-2900AC 2900W AC Power Supply for DCS-7508 and DCS-7504 Chassis

SKU: NSH-6281
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

$ 98.99

$ 105.99

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NEW Arista DCS-7504E-BND 7500E Series 7504E Switch Chassis Bundle

SKU: NSN-4811
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Arista DCS-7504E-BND 7500E Series 7504E Switch Chassis Bundle

SKU: NSH-7482
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days