Your search for "qsfp28" revealed the following:
Cisco C8500-12X4QC 12x 10GB SFP+ 2x 40GB QSFP+ 2x 100GB QSFP28 Edge Platform
SKU: NSB-7862
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell S4148T-ON 48x 10GB Copper 2x 40GB QSFP+ 4x 100GB QSFP28 F-B No OS10 Switch
SKU: NSB-9788
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N3K-C34180YC 48x 25GB SFP+ 6x 100GB QSFP28 Back-to-Front Air Switch
SKU: NSN-8251
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista AOC-Q-Q-100G-10M 10m 100GB QSFP28 Active Optical Cable
SKU: NSN-5326
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N3K-C3132C-Z 32x 100 Gigabit QSFP28 Front-to-Back Airflow Switch
SKU: NSN-8215
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N3K-C36180YC-R 48x 25GB SFP+ 6x 100GB QSFP28 B-F Airflow (DC) Switch
SKU: NSN-0235
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4112T-ON 12x 10GB Copper 3x 100GB QSFP28 F-B Air AC (No OS10) Switch
SKU: NSN-9954
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW HPE JQ075A FlexFabric 5945 Series 16x 100 Gigabit QSFP28 Switch
SKU: NSN-3668
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper EX4650-48Y-DC-AFO 48x 25GB SFP28 8x 100GB QSFP28 F-B Airflow Switch
SKU: NSN-3467
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Arista CAB-Q-4S-100G-3M 3m 100GB QSFP to 4x 25GB SFP28 DA Breakout Cable
SKU: NSB-5255
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days