Your search for "QSFP28" revealed the following:

Fortinet FS-1024E FortiSwitch 24x SFP+ 2x QSFP28 Local Management Only Switch

SKU: NSB-9504
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Mellanox MFA1A00-C010 10m 100GB QSFP28 Active Optical Cable

SKU: NSN-8616
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Extreme VSP7400-48Y-8C 48x 25G SFP28 8x 100G QSFP28 No Fans No PSU Switch

SKU: NSN-3377
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco Meraki MA-CBL-100G-3M 3m 100GB QSFP28 Stacking Cable for MS450 MS355

SKU: NSN-5525
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Dell S4112F-ON-RA 12x 10GB SFP+ 3x 100GB QSFP28 B-F Air OS10 Switch

SKU: NSN-9957
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Mellanox MCX416A-CCAT ConnectX-4 2x 100GB QSFP28 PCI-E3x16 Server Network

SKU: NSN-8807
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N3K-C36180YC-R 48x 25GB SFP+ 6x 100GB QSFP28 F-B Airflow (DC) Switch

SKU: NSN-0237
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper QFX5110-48S-DC-AFI 48x 10GB SFP+ 4x 100GB QSFP28 B-F Air (DC) Switch

SKU: NSN-3622
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Nvidia Mellanox MSN2010-CB2F 18x 25GB SFP28 4x QSFP28 B-F Air (P2C) Onyx Switch

SKU: NSB-6773
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