Your search for "juniper qsfp-40g" revealed the following:
Cisco CVR-QSFP-SFP10G 40GB QSFP+ to 10GB SFP+ Adapter
SKU: NSH-8089
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 83.99
• Only 2 remaining
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NEW Cisco C9500-24Q-E Catalyst 9500 Series 24x 40GB QSFP+ F-B Airflow Switch
SKU: NSN-3658
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 1,879.99
• Only 1 remaining
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NEW Cisco QSFP-H40G-ACU10M 10m 40GB QSFP+ Direct Attach Copper Cable
SKU: NSN-3270
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 704.99
• 5 in stock
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HPE Aruba JL579A 8320 Series 32x 40GB QSFP+ Front to Back Airflow Switch
SKU: NSH-8271
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 3,329.99
• Only 2 remaining
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NEW Arista DCS-7280QRA-C36SM-R 24x 40G QSFP+ 12x QSFP28 B-F Switch Router
SKU: NSN-6777
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 7,992.99
• Only 1 remaining
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Cisco C9500-12Q-E Catalyst 9500 12x 40GB QSFP+ Front-to-Back Airflow Switch
SKU: NSH-8340
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 489.99
• Only 2 remaining
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NEW HPE JL251A 40GB BASE-BiDi MMF LC QSFP+ Transceiver
SKU: NSN-5946
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 204.99
• 11 in stock
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Cisco N7K-F312FQ-25 N7000 F3-Series 12x 40 Gigabit Ethernet QSFP+ Switch Module
SKU: NSH-5823
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 822.99
• Only 2 remaining
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HPE JG510A 5900AF-48G-4XG-2QSFP+ 48x 1GB RJ45 4x 10GB SFP+ 2x 40GB QSFP+ Switch
SKU: NSH-3597
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 299.99
• Only 2 remaining
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Arista HPE DCS-7260QX-64-R JH802A 64x 40GB QSFP+ 2x 10GB SFP+ B-F Air Switch
SKU: NSH-7481
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 219.99
• 5 in stock
Call if you need more