Your search for "PWR-500-DC-F" revealed the following:

Arista DCS-7280TRA-48C6-R 48x 10GB RJ45 6x 100GB QSFP28 AM B-F Switch Router

SKU: NSB-5389
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7050TX-72-R 48x 10GB Copper 6x 40GB (2x MXP) B-F Airflow Switch

SKU: NSN-6526
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280SE-68-F 48x 10GB SFP+ 2x 100GB QSFP100 F-B Airflow Switch

SKU: NSN-1667
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280SR-48C6-M-R 48x 10GB SFP+ 6x 100GB QSFP28 B-F Airflow Switch

SKU: NSN-0397
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280SE-72-F 48x 10GB SFP+ 2x 100GB MXP Front-to-Back Air Switch

SKU: NSN-2427
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280SE-68-R 48x 10GB SFP+ 2x 100GB QSFP100 B-F Airflow Switch

SKU: NSN-3814
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280SR-48C6-M-F 48x 10GB SFP+ 6x 100GB QSFP F-B Airflow Switch

SKU: NSN-2365
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7050CX3-32S-R 32x 100GB QSFP100 2x 10GB SFP+ B-F Air Switch

SKU: NSN-3614
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Arista DCS-7280SR3K-48YC8-F 48x 25GB SFP28 8x 100GB QSFP28 F-B Air Switch Router

SKU: NSB-9427
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280SE-72-R 48x 10GB SFP+ 2x 100GB MXP Back-to-Front Air Switch

SKU: NSN-2449
Condition: New
Shipping: Overnight Options
Warranty: 365 days