Your search for "univ-250w-ps-ac" revealed the following:

Juniper UNIV-250W-PS-AC NSMXpress 250W AC Power Supply

SKU: NSB-0362
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper UNIV-250W-PS-AC NSMXpress 250W AC Power Supply

SKU: NSN-6596
Condition: New
Shipping: Overnight Options
Warranty: 365 days