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

NEW Nvidia Mellanox MC2210411-SR4L 40GB BASE-SR4 850nm DOM MMF QSFP+ Transceiver

SKU: NSN-1684
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Extreme EC720001F-E6 VSP 7254XSQ 48x 10G SFP+ 6x 40G QSFP+ F-B (DC) Switch

SKU: NSN-5218
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Extreme EC7200A1F-E6 VSP 7254XSQ 48x 10G SFP+ 6x 40G QSFP+ F-B (AC) Switch

SKU: NSH-8294
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Extreme Brocade BR-MLX-40Gx4-M 4x 40GB QSFP+ Router Module

SKU: NSN-2651
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Fiberstore QSFP-4SFP10G-AOC 1m 1x 40GB to 4x 10GB SFP+ Breakout Cable

SKU: NSB-0904
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Extreme 10319 40GB BASE-SR4 850nm MPO MMF QSFP+ Transceiver

SKU: NSN-5558
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N9K-X9736PQ Nexus 9000 36x 40GB QSFP+ Switch Line Card

SKU: NSN-8792
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Nvidia Mellanox MAM1Q00A-QSA 40GB QSFP+ to 10GB SFP+ Ethernet Adapter

SKU: NSN-1016
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Extreme 48046 X8 BDXA-40G12X 12x 40GB QSFP+ Switch Module

SKU: NSN-3908
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N2K-C2348TQ 48x 10GB Copper 6x 40GB QSFP+ B-F Airflow Fabric Extender

SKU: NSN-2074
Condition: New
Shipping: Overnight Options
Warranty: 365 days