Your search for "qsfp28" revealed the following:

NEW Extreme 17360 X690-48t-2q-4c 48x 10GE 2x 40G QSFP+ 4x 100G QSFP28 Switch

SKU: NSN-5020
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Extreme 10401 100GB BASE-SR4 850nm MMF MPO QSFP28 Transceiver

SKU: NSN-6160
Condition: New
Shipping: Overnight Options
Warranty: 365 days

EdgeCore 7712-32X-O-48V-F AS7712-32X 32x 100GB QSFP28 F-B Airflow (DC) Switch

SKU: NSB-0618
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Ruckus ICX7850-32Q ICX 7850 Series 32x 100GB QSFP28 Switch

SKU: NSN-8072
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Nvidia Mellanox MSN2700-CS2R 32x 100GB QSFP28 Front-to-Back (C2P) Onyx Switch

SKU: NSB-6735
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Extreme 17350 X690-48x-2q-4c 48x 10GB SFP+ 2x 40GB QSFP+ 4x 100GB QSFP28 Switch

SKU: NSB-4638
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Ruckus ICX7550-48F-E2 36x 1GB SFP 12x 10GB SFP+ 2x 100GB QSFP28 F-B Air Switch

SKU: NSB-7426
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

EdgeCore 5912-54X-O-48V-B AS5912-54X 48x 10GB SFP+ 6x QSFP28 B-F (DC) Switch

SKU: NSB-1430
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Mellanox MMA1B00-E100 100GB BASE-SR4 850nm MMF MPO QSFP28 Transceiver

SKU: NSN-8606
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Nvidia Mellanox MSN3420-CB2FC 48x 25GB SFP28 12x 100GB QSFP28 B-F CL Switch

SKU: NSN-0686
Condition: New
Shipping: Overnight Options
Warranty: 365 days