Your search for "qdd-400g-dr4" revealed the following:
Cisco QDD-400G-DR4-S 400GB BASE-DR4 MPO-12 500m parallel SMF QSFP-DD Transceiver
SKU: NSB-2427
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 194.99
• Only 2 remaining
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NEW Arista QDD-400G-DR4 400GBASE-DR4 500m parallel SMF QSFP-DD Transceiver
SKU: NSN-2257
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 619.99
• Only 1 remaining
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Arista QDD-400G-DR4 400GBASE-DR4 500m parallel SMF QSFP-DD Transceiver
SKU: NSB-5243
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 606.99
• Only 2 remaining
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Arista QDD-400G-XDR4 400GBASE-XDR4 2km over parallel SMF QSFP-DD Transceiver
SKU: NSB-5244
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 133.99
• 97 in stock
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NEW Arista QDD-400G-FR4 400GB BASE-FR4 1310nm SMF 2km QSFP-DD Transceiver
SKU: NSN-6734
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 437.99
• Only 2 remaining
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Arista QDD-400G-FR4 400GB BASE-FR4 1310nm SMF 2km QSFP-DD Transceiver
SKU: NSB-5245
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 429.99
• Only 2 remaining
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Arista OSFP-800G-2XDR4 8x 100GBASE-FR 2km Over Parallel SMF OSFP Transceiver
SKU: NSB-2126
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,203.99
• 32 in stock
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Arista QSFP-100G-FR 100GBASE-FR Single Lambda 1310nm 2km SMF QSFP28 Transceiver
SKU: NSB-5287
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 112.99
• 95 in stock
Call if you need more
NEW Arista QDD-400G-XDR4 400GBASE-XDR4 2km over parallel SMF QSFP-DD Transceiver
SKU: NSN-6733
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Arista QDD-400G-SR8 400GB BASE-SR8 100m Parallel OM4 MMF QSFP-DD Transceiver
SKU: NSB-5242
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days