Your search for "qsfp28" revealed the following:
Dell N3248TE-ON-RA 48x 1GB RJ45 4x 10GB SFP+ 2x 100GB QSFP28 B-F Air OS6 Switch
SKU: NSB-8628
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista CAB-Q-Q-100G-3M 3m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSN-6757
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco N3K-C3132C-Z 32x 100 Gigabit QSFP28 Front-to-Back Airflow Switch
SKU: NSB-6964
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-X9732C-EX 32x 100GB QSFP28 Switch Line Card
SKU: NSN-1826
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S4148FE-ON-RA 48x 10GB SFP+ 2x 40GB QSFP+ 4x QSFP28 B-F No OS10 Switch
SKU: NSB-9791
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper MPC7E-MRATE-RB MX2000 Series 12x 100GB QSFP28 Router Line Card
SKU: NSB-2701
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell S4148FE-ON 48x 10GB SFP+ 2x 40GB QSFP+ 4x 100GB QSFP28 F-B No OS10 Switch
SKU: NSB-9790
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5110-48S-DC-AFO 48x 10GB SFP+ 4x 100GB QSFP28 F-B Air (DC) Switch
SKU: NSH-8243
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
HPE Q6M29A SN2410bM 48x SFP+ (24x Active) 8x QSFP28 (4x Active) SAN Switch
SKU: NSB-6903
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco NCS-5011 NCS 5000 Series 32x 100GB QSFP28 Router
SKU: NSN-9605
Condition: New
Shipping: Overnight Options
Warranty: 365 days