Your search for "Juniper QSFP-40G" revealed the following:
NEW Juniper QFX5210-64C-AFO 64x 100GB QSFP28 F-B Airflow Switch
SKU: NSN-3636
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Brocade 40G-QSFP-LR4 40GB BASE-LR4 1310nm SMF DDM SC QSFP+ Transceiver
SKU: NSN-3763
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista AOC-Q-Q-40G-75M 75m 40 Gigabit QSFP+ Active Optical Cable
SKU: NSN-6742
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper JNP-100G-4X25G-1M 1m 100 Gigabit QSFP28 to 4x 25 Gigabit SFP+
SKU: NSN-7154
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme EC8404003-E6 VSP 8400 Series 8408QQ 8x 40G QSFP+ Switch Module
SKU: NSN-4044
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW HPE JH234-61001 X242 Series 40G QFP+ to QSFP+ 1m Direct Attach Copper Cable
SKU: NSN-6231
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5200-48Y-DC-AFI 48x 25GB SFP28 6x 100GB QSFP28 B-F Air (DC) Switch
SKU: NSH-8258
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper JNP-100G-DAC-3M 3m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSH-9322
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5210-64C-AFO QFX5210 Series 64x 100GB QSFP28 F-B Airflow Switch
SKU: NSH-8261
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista AOC-Q-Q-40G-15M 15m 40 Gigabit QSFP+ to QSFP+ Active Optical Cable
SKU: NSN-5975
Condition: New
Shipping: Overnight Options
Warranty: 365 days