Your search for "QSFP28" revealed the following:
HPE JH395A FlexFabric 5940 Series 48x 10GB SFP+ 6x 100GB QSFP28 Switch
SKU: NSB-8413
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,875.99
• Only 2 remaining
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NEW Nvidia Mellanox MSN2410-BB2FC 48x 10GB SFP28 8x 100GB QSFP28 B-F CL Switch
SKU: NSN-0268
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 6,899.99
• Only 2 remaining
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Arista DCS-7280TR-48C6-R 48x 10GB Copper 6x 100GB QSFP28 B-F Airflow Switch
SKU: NSH-8129
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,879.99
• Only 2 remaining
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Nvidia Mellanox MMA1L30-CM 100GB 1310nm SMF 2km Duplex LC DOM QSFP28 Transceiver
SKU: NSB-3080
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 133.99
• 4 in stock
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Mellanox MSN4600-CS2F 64x 100GB QSFP28 Back-to-Front Airflow (P2C) Onyx Switch
SKU: NSB-6707
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 11,244.99
• Only 1 remaining
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Nvidia Mellanox MSB7560-E CS7500 Series 36x 100GB QSFP28 Leaf Switch Blade
SKU: NSB-6796
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 453.99
• 7 in stock
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Dell N3224T-ON 24x 1GB RJ45 4x 10GB SFP+ 2x 100GB QSFP28 F-B Air Switch
SKU: NSB-8621
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 245.99
• Only 2 remaining
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Dell N3248P-ON 48x 1GB PoE RJ45 4x 10GB SFP+ 2x 100GB QSFP28 F-B OS6 Switch
SKU: NSB-9280
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 1,942.99
• Only 2 remaining
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Nvidia Mellanox MSN2410-CB2F 48x 25GB SFP28 8x QSFP28 B-F Air (P2C) Onyx Switch
SKU: NSB-6747
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,319.99
• Only 1 remaining
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Arista DCS-7260CX3-64-F 64x 100GB QSFP28 2x 10GB SFP+ F-B Airflow Switch
SKU: NSB-7175
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,875.99
• Only 2 remaining
Call if you need more