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

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

NEW Arista CAB-Q-S-3M 3m 40GB QSFP+ to 4x 10GB SFP+ Breakout Cable

SKU: NSN-9084
Condition: New
Shipping: Overnight Options
Warranty: 365 days

HPE R0Y49A 6x 40G QSFP 48x 10G SFP+ Back to Front Airflow Switch Fabric Module

SKU: NSB-5625
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7300X-32Q-LC 7300X Series 32x 40GB QSFP+ Switch Line Card

SKU: NSN-2181
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7250QX-64-F 64x 40GB QSFP+ Front-to-Back Airflow Switch

SKU: NSN-2459
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

NEW Arista DCS-7280QRA-C36S-R 24x 40GB QSFP+ 12x 100GB QSFP100 B-F Air Switch

SKU: NSN-2363
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista QSFP-100G-CWDM4 100GB BASE-CWDM4 SMF Optical QSFP28 Transceiver

SKU: NSN-5677
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Arista CAB-Q-S-3M 3m 40GB QSFP+ to 4x 10GB SFP+ Breakout Cable

SKU: NSB-5301
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280SE-64-R 48x 10GB SFP+ 4x 40GB QSFP+ Back-to-Front Air Switch

SKU: NSN-0084
Condition: New
Shipping: Overnight Options
Warranty: 365 days