Your search for "Juniper QSFP-40G" revealed the following:
NEW Cisco C9300L-48UXG-2Q-E 48x 1GB UPoE RJ45 (12x MultiGB) 2x QSFP+ Switch
SKU: NSN-6537
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7280QRA-C36SM-F 24x 40G QSFP+ 12x QSFP28 F-B Air Switch Router
SKU: NSN-6776
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N3K-C3016Q-40GE Nexus 3000 16x 40GB QSFP+ Back-to-Front Airflow Switch
SKU: NSN-2884
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N2K-C2348TQ4F 48x 10GB Copper 6x 40GB QSFP+ Switch Fabric Extender
SKU: NSN-9089
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista CAB-Q-Q-2M 2m 40GB QSFP+ Direct Attach Copper Cable
SKU: NSN-7206
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
HPE JH231A 40GB BASE-SR4 850nm MPO MMF QSFP+ Transceiver
SKU: NSH-6442
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Arista CAB-Q-S-5M 5m 40GB QSFP+ to 4x 10GB SFP+ Breakout Cable
SKU: NSB-5302
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco C3850-NM-2-40G Catalyst 3850 2x 40GB QSFP+ Switch Module
SKU: NSN-1791
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