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

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

Cisco C9300L-24UXG-2Q-A 24x 1GB UPoE RJ45 (8x MultiGB) 2x 40GB QSFP+ Switch

SKU: NSB-5290
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Arista CAB-Q-Q-1M 1m 40 Gigabit BASE-CR4 QSFP+ Twinax Copper Cable

SKU: NSB-5294
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW HPE 720196-B21 1m 40GB QSFP+ Direct Attach Copper Cable

SKU: NSN-6249
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Extreme Brocade BR-MLX-40Gx4-M ExtremeRouting MLX 4x 40GB QSFP+ Router Module

SKU: NSH-4776
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW HPE JG661A 40GB BASE-LR4 1310nm SMF LC QSFP+ Transceiver

SKU: NSN-5570
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista CAB-Q-Q-1M 1m 40 Gigabit BASE-CR4 QSFP+ Twinax Copper Cable

SKU: NSN-7243
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Fortinet FG-TRAN-QSFP-4XSFP 40GB QSFP+ to 4x 10GB SFP+ AO Breakout Cable

SKU: NSN-8497
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista AOC-Q-Q-40G-10M 10m 40GB QSFP+ Active Optical Cable

SKU: NSN-5639
Condition: New
Shipping: Overnight Options
Warranty: 365 days