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 Juniper PTX10K-LC1101 PTX 10000 Series 30x 100G QSFP28 Router Line Card
SKU: NSN-4155
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme Brocade BR-MLX-40Gx4-M 4x 40GB QSFP+ Router Module
SKU: NSN-2651
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
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
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
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
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-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