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

NEW Juniper EX9251-8X4C EX9250 Series 8x 10GB SFP+ 4x 100GB QSFP28 Switch

SKU: NSN-3533
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper DPCE-R-40GE-SFP 40x 1GB SFP Enhanced Services Router Line Card

SKU: NSN-1593
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Juniper QFX5130-32CD-AFO 400GB QSFP-DD Front-to-Back Airflow Switch

SKU: NSB-7921
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco Meraki MA-QSFP-40G-CSR4 40GB BASE-CSR4 MPO12 MMF QSFP Transceiver

SKU: NSN-8324
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Juniper EX3400-24P-TAA 24x 1GB PoE+ RJ45 4x 10GB SFP+ 2x QSFP+ (TAA) Switch

SKU: NSH-8675
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Juniper SRX5K-40GE-SFP SRX 5000 Series 40x 1GB SFP Gateway Module

SKU: NSH-6639
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Juniper ACX6360-OR-AC 20x 100GB QSFP28 8x 200GB CFP2- DCO F-B Air Router

SKU: NSH-8437
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper EX9200-40F-M 40x 1GB SFP (MacSec) Switch Line Card

SKU: NSN-3883
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista QSFP-40G-LR4 BASE-LR4 40GB 1310nm Long Reach SMF LC QSFP+ Transceiver

SKU: NSN-8262
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Juniper EX4500-40F-BF EX4500 40x 10GB SFP+ Back-to-Front Airflow Switch

SKU: NSH-6588
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days