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

Cisco N7K-M324FQ-25L Nexus 7000 24x 40GB QSFP+ Switch Module

SKU: NSH-7272
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Nvidia Mellanox MSX1710-BS2R2 36x 40GB QSFP+ F-B Airflow (C2P) MLNX-OS Switch

SKU: NSB-1076
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Extreme EC7200A3F-E6 VSP 7254XSQ 24x 10G SFP+ 4x 40G QSFP+ F-B (AC) Switch

SKU: NSN-5843
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7050TX-48-F 32x 10GB Copper 4x 40GB QSFP+ F-B Airflow Switch

SKU: NSN-3974
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Ruckus E40G-QSFP-4SFP-C-0301 3m 40GB QSFP+ to 4x 10GB SFP+ DA Breakout Cable

SKU: NSN-8478
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7160-48TC6-F 48x 10GB Copper 6x 100GB QSFP F-B Air Switch

SKU: NSN-2432
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW HPE Aruba JL624A 48x 25GB SFP28 8x 100GB QSFP28 Front-to-Back Airflow Switch

SKU: NSN-3639
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Mellanox MSX1012B-2BFS 12x 40GB QSFP+ B-F Airflow (P2C) Onyx Switch

SKU: NSN-0622
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N7K-M324FQ-25L Nexus 7000 24x 40GB QSFP+ Switch Module

SKU: NSN-6254
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW HPE Aruba JL625A 48x 25GB SFP28 8x 100GB QSFP28 Back-to-Front Airflow Switch

SKU: NSN-3640
Condition: New
Shipping: Overnight Options
Warranty: 365 days