Your search for "Juniper QSFP-40G" revealed the following:
Juniper JNP-QSFP-40G-LX4 40GB BASE-LX4 1310nm MMF QSFP+ Transceiver
SKU: NSH-6634
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 48.99
• 32 in stock
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Juniper JNP-QSFP-40G-LR4 40GB BASE-LR4 1310nm SMF QSFP+ Transceiver
SKU: NSB-2988
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 192.99
• Only 2 remaining
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NEW Juniper QFX-QSFP-40G-SR4 40GB BASE-SR4 850nm MMF QSFP+ Transceiver
SKU: NSN-8673
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 39.99
• Only 2 remaining
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Juniper QFX-QSFP-40G-ESR4 40GB BASE-ESR4 850nm MMF QSFP+ Transceiver
SKU: NSH-9694
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 105.99
• Only 2 remaining
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NEW Juniper JNP-QSFP-40G-LR4 40GB BASE-LR4 1310nm SMF QSFP+ Transceiver
SKU: NSN-5599
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 207.99
• Only 2 remaining
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NEW Juniper 740-032986 QFX-QSFP-40G-SR4 OM3 850nm MMF 100m QSFP+ Transceiver
SKU: NSN-0947
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 39.99
• Only 1 remaining
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Juniper 740-032986 QFX-QSFP-40G-SR4 OM3 850nm MMF 100m QSFP+ Transceiver
SKU: NSB-2055
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 19.99
• 99 in stock
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NEW Juniper QSFPP-40GBASE-LR4 40GB BASE-LR4 1310nm SMF QSFP+ Transceiver
SKU: NSN-3044
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 344.99
• Only 2 remaining
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NEW Juniper EX4600-40F-AFI 24x 10G SFP+ 4x 40G QSFP+ B-F Airflow Switch
SKU: NSN-1587
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 1,586.99
• Only 1 remaining
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Juniper QSFPP-40GBASE-LR4 40GB BASE-LR4 1310nm SMF QSFP+ Transceiver
SKU: NSH-8886
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 126.99
• Only 2 remaining
Call if you need more