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

NEW Arista DCS-7124SX-R 7100 Series 24x 10GB SFP+ Back-to-Front Airflow Switch

SKU: NSN-3139
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

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

SKU: NSB-9368
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days