Your search for "qsfp28" revealed the following:
NEW Arista DCS-7280QRA-C36SM-F 24x 40G QSFP+ 12x QSFP28 F-B Air Switch Router
SKU: NSN-6776
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW EdgeCore 7712-32X-O-48V-F AS7712-32X 32x 100GB QSFP28 F-B Air (DC) Switch
SKU: NSN-8765
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Ruckus ICX7550-48ZP 36x 2.5GB PoE+ RJ45 12x 10GB Copper 2x QSFP28 Switch
SKU: NSN-0244
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme 16791 X590-24T-1Q-2C 24x 10GB Copper 1x 40GB QSFP+ 2x QSFP28 Switch
SKU: NSN-4055
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Extreme EN-SLX-9640-24S-AC-F 24x 10GB SFP+ 4x 100GB QSFP28 F-B Airflow Switch
SKU: NSH-8534
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell Z9100-ON-RA EMC Z-Series 32x 100GB QSFP28 B-F (No OS10 License) Switch
SKU: NSN-9935
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Extreme SLX9740-40C ExtremeRouting SLX 9740 40x 100GB QSFP28 F-B Airflow Router
SKU: NSB-6384
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme Brocade BR-SLX-9240-32C-AC-F 32x 100GB QSFP28 F-B Airflow Switch
SKU: NSN-3851
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Ruckus ICX7550-24ZP-E2 12x 2.5GB PoE+ RJ45 10GB PoE+ RJ45 2x QSFP28 F-B Switch
SKU: NSB-7423
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Nvidia Mellanox MFA1A00-C015 15m 100GB QSFP28 Active Optical Cable
SKU: NSN-8621
Condition: New
Shipping: Overnight Options
Warranty: 365 days