Your search for "ex4500-40f-vc1" revealed the following:
Juniper EX4500-40F-VC1-FB 40x 10GB SFP+ 2x Mod Slot Front-to-Back Airflow Switch
SKU: NSH-6624
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 225.99
• Only 2 remaining
Call if you need more
NEW Juniper EX4500-40F-VC1-FB 40x 10GB SFP+ 2x Mod Slot F-B Airflow Switch
SKU: NSN-2682
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 1,868.99
• Only 2 remaining
Call if you need more
Juniper EX4500-40F-VC1-BF 40x 10GB SFP+ 2x Mod Slot Back-to-Front Airflow Switch
SKU: NSH-5705
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper EX4500-40F-VC1-BF 40x 10GB SFP+ 2x Mod Slot Back-to-Front Air Switch
SKU: NSN-1586
Condition: New
Shipping: Overnight Options
Warranty: 365 days