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

NEW Arista DCS-7050SX-72Q-F 48x 10GB SFP+ 6x 40GB QSFP+ Front-to-Back Air Switch

SKU: NSN-2402
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7050TX-48-F 32x 10GB Copper 4x 40GB QSFP+ F-B Airflow Switch

SKU: NSN-3974
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7050TX-64-F 48x 10GB Copper 4x 40GB QSFP+ F-B Air Switch

SKU: NSN-2504
Condition: New
Shipping: Overnight Options
Warranty: 365 days

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

SKU: NSH-7465
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280SE-64-R 48x 10GB SFP+ 4x 40GB QSFP+ Back-to-Front Air Switch

SKU: NSN-0084
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280TRA-48C6-R 48x10G RJ45 6x100G QSFP AlgoMatch RF Switch Router

SKU: NSN-6781
Condition: New
Shipping: Overnight Options
Warranty: 365 days

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

SKU: NSN-0129
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7050SX2-72Q-F 48x 10GB SFP+ 6x 40GB QSFP+ F-B Airflow Switch

SKU: NSN-2393
Condition: New
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-7060SX2-48YC6-F 48x 25GB SFP25 6x 100GB QSFP F-B Airflow Switch

SKU: NSN-3765
Condition: New
Shipping: Overnight Options
Warranty: 365 days