Your search for "qsfp-40g-sr4" revealed the following:
Cisco Meraki MA-QSFP-40G-SR-BD 40GB BASE-SR-BiDi 850nm BiDi MMF QSFP Transceiver
SKU: NSB-1334
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 489.99
• Only 2 remaining
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Ruckus E40G-QSFP-SR4 40GB BASE-SR4 850nm OM3 MMF QSFP+ Transceiver
SKU: NSB-1450
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 69.99
• Only 2 remaining
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NEW Ruckus E40G-QSFP-SR4 40GB BASE-SR4 850nm OM3 MMF QSFP+ Transceiver
SKU: NSN-8473
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 75.99
• Only 2 remaining
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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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HPE JG325B 40GB BASE-SR4 850nm MPO QSFP+ Transceiver
SKU: NSB-5664
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 22.99
• 99 in stock
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Arista QSFP-100G-PSM4 100GB BASE-PSM4 1310nm DOM MTP/MPO SMF QSFP28 Transceiver
SKU: NSB-5279
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 48.99
• Only 2 remaining
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NEW Arista QSFP-100G-PSM4 100GB BASE-PSM4 DOM MTP/MPO SMF QSFP28 Transceiver
SKU: NSN-7242
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 51.99
• 65 in stock
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Arista QSFP-100G-CWDM4 100GB BASE-CWDM4 SMF QSFP28 Transceiver
SKU: NSB-5283
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 51.99
• Only 2 remaining
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Cisco Meraki MS425-16-HW 16x 10GB SFP+ 2x 40GB QSFP+ Unclaimed Switch
SKU: NSH-8625
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 563.99
• Only 2 remaining
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Cisco Meraki MS450-12-HW 12x 40GB QSFP+ 2x 100GB QSFP28 Unclaimed Switch
SKU: NSH-9919
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 1,739.99
• Only 2 remaining
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