Your search for "qsfp28" revealed the following:

HPE Aruba JL708C CX 8360 v2 Series 8360-12C 12x 100GB QSFP28 F-B Airflow Switch

SKU: NSB-9703
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

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

SKU: NSB-2909
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Cisco N540-24Z8Q2C-M 24x 10GB SFP+ 8x 25GB SFP28 2x 100GB QSFP28 Router

SKU: NSB-8196
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N3K-C3636C-R 36x 100GB QSFP28 Back-to-Front Airflow Switch

SKU: NSN-8260
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Dell N3224F-ON-RA 24x 1GB SFP 4x 10GB SFP+ 2x 100GB QSFP28 B-F Air OS6 Switch

SKU: NSB-9803
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Dell N3248TE-ON-RA 48x 1GB RJ45 4x 10GB SFP+ 2x QSFP28 B-F Air OS10 Switch

SKU: NSN-9971
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Chelsio T62100-LP-CR 2x 100GB QSFP28 Host Bus Adapter

SKU: NSB-0878
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Fortinet FS-1024E FortiSwitch 24x SFP+ 2x QSFP28 Registrable / Unclaimed Switch

SKU: NSC-0186
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

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

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

Arista AOC-Q-Q-100G-5M 5m 100GB QSFP28 Active Optical Cable

SKU: NSB-5265
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days