Your search for "qsfp28" revealed the following:
Juniper QFX5210-64C-AFO2 QFX5210 Series 64x 100GB QSFP28 F-B Airflow Flex Switch
SKU: NSB-3894
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell S5224F-ON-RA 24x 25GB SFP28 4x 100GB QSFP28 B-F Air OS10 Switch
SKU: NSB-6588
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW HPE Aruba JL307A 3m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSN-6164
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5110-48S-DC-AFO 48x 10GB SFP+ 4x 100GB QSFP28 F-B Air (DC) Switch
SKU: NSN-3623
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5200-32C-DC-AFO 32x 100G QSFP28 Front-to-Back Airflow (DC) Switch
SKU: NSN-3631
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5200-32C-DC-AFI 32x 100GB QSFP28 Back-to-Front Air (DC) Switch
SKU: NSN-3630
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Nvidia Mellanox MCP1600-C001E30N 1m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSB-2905
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Nvidia Mellanox MSN2100-CB2F 16x 100GB QSFP28 B-F (P2C) Onyx Switch
SKU: NSN-0070
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C92160YC-X 48x 25GB SFP28 6x 40GB QSFP+ Back-to-Front Air Switch
SKU: NSN-3866
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Chelsio T62100-LP-CR 2x 100GB QSFP28 Host Bus Adapter
SKU: NSN-8328
Condition: New
Shipping: Overnight Options
Warranty: 365 days