Your search for "100G-QSFP28-SR4" revealed the following:
NEW Arista DCS-7500R2-18CQ-LC 7500R2 Series 18x 100GB QSFP28 Switch Line Card
SKU: NSN-9203
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 2,056.99
• Only 1 remaining
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Cisco N9K-C9332C Nexus 9000 32x 100GB QSFP28 2x 10GB SFP+ B-F Airflow Switch
SKU: NSB-7711
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,039.99
• Only 2 remaining
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Arista DCS-7500R2-18CQ-LC 7500R2 Series 18x 100GB QSFP28 Switch Line Card
SKU: NSB-7177
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,029.99
• Only 1 remaining
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Cisco N9K-C9332C Nexus 9000 32x 100GB QSFP28 2x 10GB SFP+ F-B Airflow Switch
SKU: NSB-7780
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,125.99
• Only 2 remaining
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Cisco N9K-C93180YC-FX3 48x 25GB SFP28 6x 100GB QSFP28 B-F Air Switch
SKU: NSB-7724
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 10,687.99
• Only 2 remaining
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Cisco N9K-C92348GC-X 48x 1GB RJ45 4x 25GB SFP28 2x 100GB QSFP28 F-B Air Switch
SKU: NSB-8039
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 484.99
• Only 2 remaining
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Cisco N9K-C92304QC 56x 40GB QSFP+ 8x 100GB QSFP28 Front-to-Back Airflow Switch
SKU: NSB-6907
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,082.99
• Only 2 remaining
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Cisco N9K-C93180YC-FX3 48x 25GB SFP28 6x 100GB QSFP28 F-B Air Switch
SKU: NSB-3959
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 10,687.99
• Only 2 remaining
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Cisco N9K-C9508-FM-E Nexus 9500 8x Slot 800 Gbps Cloud Scale Fabric Module
SKU: NSB-7699
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 184.99
• Only 2 remaining
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Extreme 100G-QSFP28-SR4 100GB BASE-SR4 850nm MMF QSFP28 Transceiver
SKU: NSB-5759
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days