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

NEW Cisco C9500-32QC-E Catalyst 9500 32x 40GB QSFP+ Switch

SKU: NSN-4262
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7280QR-C36-R 24x 40GB QSFP+ 12x 100GB QSFP28 B-F Airflow Switch

SKU: NSN-2362
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

HPE JH359A FlexFabric 12900E Series 48x 40GB QSFP+ Switch Line Card

SKU: NSB-8339
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 Juniper SRX550-645AP 7 Gbps 8x Expansion Mod Slot Services Gateway Chassis

SKU: NSN-1588
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 Cisco C9500-32QC-A Catalyst 9500 32x 40GB QSFP+ Switch

SKU: NSN-4268
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista HPE DCS-7260QX-64-F JH801A 64x 40GB QSFP+ 2x 10GB SFP+ F-B Air Switch

SKU: NSN-2411
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista DCS-7500RA-36Q-LC 7500R Series 36x 40GB QSFP+ Switch Line Card

SKU: NSN-9206
Condition: New
Shipping: Overnight Options
Warranty: 365 days