Your search for "jpsu-850w" revealed the following:
Juniper JPSU-850W-DC-AFO QFX5120 Series 850W DC F-B Airflow Power Supply
SKU: NSB-0441
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper JPSU-850W-DC-AFO QFX5200 Series 850W DC F-B Airflow Power Supply
SKU: NSB-0514
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper JPSU-850W-DC-AFI QFX Series 850W DC Back to Front Airflow Power Supply
SKU: NSB-5046
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper JPSU-850W-AC-AFO QFX5100 Series 850W AC F-B Airflow Power Supply
SKU: NSN-0271
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper JPSU-850W-DC-AFO QFX5100 Series 850W DC F-B Airflow Power Supply
SKU: NSN-0276
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper JPSU-850W-DC-AFI QFX5100 Series 850W DC B-F Airflow Power Supply
SKU: NSB-0157
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper JPSU-850W-DC-AFO QFX5100 Series 850W DC F-B Airflow Power Supply
SKU: NSB-0156
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper JPSU-850W-AC-AFO QFX Series 850W AC Front-to-Back Air Power Supply
SKU: NSN-3481
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper JPSU-850W-DC-AFI QFX5100 Series 850W DC B-F Airflow Power Supply
SKU: NSN-0278
Condition: New
Shipping: Overnight Options
Warranty: 365 days