Your search for "juniper qsfp-40g" revealed the following:
Arista AOC-Q-Q-40G-10M 10m 40GB QSFP+ Active Optical Cable
SKU: NSB-5305
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Ruckus 40G-QSFP-C-00501 0.5m 40GB QSFP+ Direct Attach Copper Cable
SKU: NSN-8483
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
Fiberstore QSFP-4SFP10G-DAC 2m 40G QSFP+ 4SFP+ DAC QSFP - 4x SFP+ Breakout Cable
SKU: NSB-1252
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Osi QFX-SFP-1GE-T-OSI 1GB BASE-T 100m RJ-45 Juniper Compatible SFP Transceiver
SKU: NSB-1129
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
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
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 Extreme 17360 X690-48t-2q-4c 48x 10GE 2x 40G QSFP+ 4x 100G QSFP28 Switch
SKU: NSN-5020
Condition: New
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
Dell 5KFVW N4000 Series 2x 40GB QSFP+ Switch Module
SKU: NSH-8069
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days