Your search for "QSFP28" revealed the following:
Dell S4112T-ON-RA 12x 10GB Copper 3x 100GB QSFP28 B-F Air AC (No OS10) Switch
SKU: NSB-9780
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 4,157.99
• Only 2 remaining
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HPE Aruba JL309A 100GB BASE-SR4 MPO MMF Optical QSFP28 Transceiver
SKU: NSB-5546
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 263.99
• Only 2 remaining
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HPE Aruba JL625A 48x 25GB SFP28 8x 100GB QSFP28 Back-to-Front Airflow Switch
SKU: NSH-8267
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 13,125.99
• Only 2 remaining
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Extreme Brocade BR-SLX-9140-48V-AC-F 48x 25GB SFP28 6x QSFP28 F-B Air Switch
SKU: NSB-4667
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 606.99
• Only 1 remaining
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NEW Cisco N9K-C9236C Nexus 9200 36x 100GB QSFP28 Front-to-Back Airflow Switch
SKU: NSN-8179
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 2,937.99
• 6 in stock
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Dell Z9100-ON EMC Z-Series 32x 100GB QSFP28 F-B Airflow (No OS10) Switch
SKU: NSB-9749
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,262.99
• Only 2 remaining
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NEW HPE Aruba JL309A 100GB BASE-SR4 MPO MMF Optical QSFP28 Transceiver
SKU: NSN-6161
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 349.99
• Only 2 remaining
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Cisco QSFP-100G-ZR4-S 100GB BASE-ZR4 SMF Duplex LC 80km QSFP28 Transceiver
SKU: NSB-2203
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 8,437.99
• Only 2 remaining
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Dell Z9264F-ON EMC Z-Series 64x 100GB QSFP28 F-B Air (No OS10 License) Switch
SKU: NSB-9754
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 1,174.99
• Only 2 remaining
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NEW Cisco N9K-C9236C 36x 100GB QSFP28 Back-to-Front Airflow Switch
SKU: NSN-2386
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 2,937.99
• 6 in stock
Call if you need more