Your search for "QSFP28" revealed the following:

Arista DCS-7800R3-48CQM-LC 48x 100GB QSFP28 w/ MACsec Router Line Card

SKU: NSB-0973
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Nvidia Mellanox MSN2100-CB2FC 16x 100GB QSFP28 B-F Cumulus Linux Switch

SKU: NSN-0107
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Extreme EN-SLX-9030-48T-4C 48x 10GE Copper 4x 100G QSFP28 No Fans/PSU Switch

SKU: NSN-3681
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Arista CAB-Q-Q-100G-3M 3m 100GB QSFP28 Direct Attach Copper Cable

SKU: NSB-5251
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Extreme Brocade BR-SLX-9140-48V-AC-R 48x 25 SFP28 6x QSFP28 B-F Air Switch

SKU: NSN-4589
Condition: New
Shipping: Overnight Options
Warranty: 365 days

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

SKU: NSN-9956
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW nVidia Mellanox MCX555A-ECAT ConnectX-5 1x 100GB QSFP28 PCIe3.0x16 NIC

SKU: NSN-1088
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Arista DCS-7050SX3-48C8-R 48x 10GB SFP+ 8x 100GB QSFP28 B-F Air Switch

SKU: NSB-9375
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Nvidia Mellanox MCP1600-C02AE26N 2.5m 100GB QSFP28 Direct Attach Cable

SKU: NSN-8965
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW HPE Aruba JL625A 48x 25GB SFP28 8x 100GB QSFP28 Back-to-Front Airflow Switch

SKU: NSN-3640
Condition: New
Shipping: Overnight Options
Warranty: 365 days