Your search for "qsfp-40g-lr4" revealed the following:
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 Arista QSFP-40G-PLR4 40GB BASE-LR4 1310nm SMF MTP-12 QSFP+ Transceiver
SKU: NSN-5333
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 178.99
• 65 in stock
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Arista QSFP-40G-PLR4 40GB BASE-LR4 1310nm SMF MTP-12 QSFP+ Transceiver
SKU: NSB-5339
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 62.99
• 8 in stock
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Brocade 40G-QSFP-LR4 40GB BASE-LR4 1310nm SMF DDM SC QSFP+ Transceiver
SKU: NSH-7177
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 112.99
• 83 in stock
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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
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Cisco QSFP-40GE-LR4 40GB BASE-LR4 1310nm SMF QSFP+ Transceiver
SKU: NSH-5559
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 192.99
• Only 2 remaining
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Cisco WSP-Q40GLR4L 40GB BASE-LR4-Lite 1310nm SMF QSFP+ Transceiver
SKU: NSH-5570
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 19.99
• Only 2 remaining
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NEW Cisco QSFP-40GE-LR4 40GB BASE-LR4 1310nm SMF QSFP+ Transceiver
SKU: NSN-1554
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 223.99
• Only 1 remaining
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NEW Cisco WSP-Q40GLR4L 40GB BASE-LR4-Lite 1310nm SMF QSFP+ Transceiver
SKU: NSN-5086
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 41.99
• 41 in stock
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Ruckus E40G-QSFP-LR4 40GB BASE-LR4 1337.5nm SMF QSFP+ Transceiver
SKU: NSB-1456
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 993.99
• Only 2 remaining
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