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

NEW Arista DCS-7280CR-48-F 48x 100G QSFP100 8x 40G QSFP+ F-R Airflow Switch

SKU: NSN-1509
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Extreme EC8404006-E6 8418XTQ 16x 10GE 2x 40G QSFP+ Switch Module

SKU: NSN-5182
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco C6840-X-LE-40G Catalyst 6800X 40x 10GB SFP+ 2x 40GB QSFP+ Switch

SKU: NSN-7757
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista CAB-Q-Q-0.5M 0.5m 40GB QSFP+ Direct Attach Copper Cable

SKU: NSN-7312
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW HPE JH233A BASE-SR4 40 Gigabit 850nm MMF Transceiver QSFP+

SKU: NSN-9550
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Arista AOC-Q-Q-40G-15M 15m 40GB QSFP+ Active Optical Cable

SKU: NSB-5306
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

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

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

Arista AOC-Q-Q-40G-5M 5m 40GB QSFP+ Active Optical Cable

SKU: NSB-1039
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Ruckus 40G-QSFP-C-00501 0.5m 40GB QSFP+ Direct Attach Copper Cable

SKU: NSB-1479
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

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