Your search for "QSFP28" revealed the following:

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

Extreme EN-SLX-9640-24S 24x 10G SFP+ 4x 100G QSFP28 No Fans No PSU Switch

SKU: NSH-8533
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

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 Fortinet FS-3032E 3000 Series 32x100GB QSFP28 Registrable/Unclaimed Switch

SKU: NSN-1705
Condition: New
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

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

NEW Arista DCS-7260CX3-64-F 64x 100GB QSFP28 2x 10GB SFP+ F-B Airflow Switch

SKU: NSN-9678
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

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

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