Your search for "juniper qsfp-40g" revealed the following:

NEW Arista DCS-7050QX-32S-R 32x 40GB QSFP+ 4x 10GB SFP+ Back-to-Front Air Switch

SKU: NSN-1736
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco Meraki MS355-24X2-HW 24x mGig UPoE 4x SFP+ 2x QSFP+ Unclaimed Switch

SKU: NSN-3600
Condition: New
Shipping: Overnight Options
Warranty: 365 days
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NEW Arista DCS-7050TX-128-R 96x 10GB Copper 8x 40GB QSFP+ B-F Airflow Switch

SKU: NSN-5114
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco A9K-MPA-2X40GE ASR 9000 2x 40GB QSFP+ Modular Port Adapter

SKU: NSN-2151
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Ruckus Brocade ICX7750-26Q ICX 7750 26x 40GB QSFP+ Switch

SKU: NSN-2433
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Ruckus Brocade ICX7650-2X40GQ ICX 7650 2x 40GB QSFP+ Switch Module

SKU: NSB-6292
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco C6800-SUP6T-XL Catalyst 6800 Switch Supervisor Engine 6T XL Module

SKU: NSN-2341
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Ruckus ICX7550-24-E2 ICX 7550 Series 24x 1GB RJ45 2x 40GB QSFP+ F-B Air Switch

SKU: NSB-7421
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Ruckus Brocade ICX7450-24P-E 24x 1GB PoE+ RJ45 4x SFP+ 2x 40GB QSFP+ Switch

SKU: NSN-3771
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N3K-C3172TQ-32T 32x 10GB Copper 6x 40GB QSFP+ Front-to-Back Air Switch

SKU: NSN-8245
Condition: New
Shipping: Overnight Options
Warranty: 365 days