Your search for "QSFP28" revealed the following:
Cisco Meraki MA-CBL-100G-3M 3m 100GB QSFP28 Stacking Cable for MS450 MS355
SKU: NSB-6434
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5120-32C-AFI QFX5120 Series 32x 100GB QSFP28 B-F Airflow Switch
SKU: NSN-3712
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C93180YC-EX-24 24x 25GB SFP28 6x 100GB QSFP28 B-F Airflow Switch
SKU: NSN-0453
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C93108TC-FX3P 48x MultiGB UPoE RJ-45 6x 100GB QSFP28 FB Air Switch
SKU: NSN-0630
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N3K-C36180YC-R 48x 25GB SFP+ 6x 100GB QSFP28 Front-to-Back Air Switch
SKU: NSN-3563
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco N9K-C93180YC-EX-24 24x 25GB SFP28 6x 100GB QSFP28 F-B Airflow Switch
SKU: NSB-7728
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Extreme 100G-LR4-QSFP10KM 100GB SMF 10km LC QSFP28 Transceiver
SKU: NSB-1868
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
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
NEW HPE JQ075A FlexFabric 5945 Series 16x 100 Gigabit QSFP28 Switch
SKU: NSN-3668
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