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

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 Extreme 17702 X770-32q-BF-AC 32x 40G QSFP+ B-F Airflow Switch

SKU: NSN-3821
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280QR-C36-M-F 24x 40G QSFP+ 12x 100G QSFP F-R Airflow Switch

SKU: NSN-1841
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Cisco C9300L-48UXG-2Q-A 48x 1GB UPoE RJ45 (12x MultiGB) 2x 40GB QSFP+ Switch

SKU: NSB-5291
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

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

SKU: NSH-4776
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Cisco C9300L-24UXG-2Q-A 24x 1GB UPoE RJ45 (8x MultiGB) 2x 40GB QSFP+ Switch

SKU: NSB-5290
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280QR-C36-F 24x 40G QSFP+ 12x 100G QSFP F-R Airflow Switch

SKU: NSN-2371
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW HPE JG661A 40GB BASE-LR4 1310nm SMF LC QSFP+ Transceiver

SKU: NSN-5570
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 C3850-NM-2-40G Catalyst 3850 2x 40GB QSFP+ Switch Module

SKU: NSN-1791
Condition: New
Shipping: Overnight Options
Warranty: 365 days