Your search for "Juniper QSFP-40G" revealed the following:

Juniper QFX5200-32C-DC-AFI 32x 100GB QSFP28 Back-to-Front Airflow (DC) Switch

SKU: NSH-8254
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper QFX5120-48Y-AFI 48x 25GB SFP28 8x 100GB QSFP28 B-F Airflow Switch

SKU: NSN-3626
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista QSFP-40G-SRBD 40GB BASE-BIDI 850nm BiDI MMF QSFP+ Transceiver

SKU: NSN-5550
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper DPCE-X-40GE-SFP 40x 1GB SFP Enhanced Services DPC Module

SKU: NSN-4413
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Juniper QFX5200-48Y-AFI 48x 25GB SFP28 6x 100GB QSFP28 B-F Airflow Switch

SKU: NSH-8256
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Juniper QFX5210-64C-AFO2 QFX5210 Series 64x 100GB QSFP28 F-B Airflow Flex Switch

SKU: NSB-3894
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

NEW Juniper QFX5110-48S-DC-AFI 48x 10GB SFP+ 4x 100GB QSFP28 B-F Air (DC) Switch

SKU: NSN-3622
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper QFX5200-48Y-AFO 48x 25GB SFP28 6x 100GB QSFP28 F-B Air Switch

SKU: NSN-3538
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper QFX5120-48Y-DC-AFI 48x 25GB SFP+ 8x 100GB QSFP28 B-F Air (DC) Switch

SKU: NSN-3628
Condition: New
Shipping: Overnight Options
Warranty: 365 days