Your search for "QSFP28" revealed the following:

NEW Dell 407-BBTE 15FMD S6100-ON 8x 100GB QSFP28 Switch Module

SKU: NSN-0679
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper QSFP-100GBASE-SR4 100GB BASE-SR4 850nm MMF QSFP28 Transceiver

SKU: NSN-4077
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper QFX5200-48Y-AFO 48x 25GB SFP28 6x 100GB QSFP28 F-B Air Switch

SKU: NSN-3538
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Dell S4128T-ON-RA 28x 10GB 2x 100GB QSFP28 B-F Air 210-ALTI OS10 Switch

SKU: NSN-8122
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Juniper QFX5120-48Y-DC-AFO 48x 25GB SFP28 8x 100GB QSFP28 F-B Air (DC) Switch

SKU: NSH-8251
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Dell S5224F-ON 24x 25GB SFP28 4x 100GB QSFP28 Front-to-Back Air OS10 Switch

SKU: NSN-3887
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Dell S5212F-ON-RA 12x 25GB SFP28 3x 100GB QSFP28 B-F Air OS10 Switch

SKU: NSN-8133
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Dell Q28-100G-SWDM4 X7CCC 100GB BASE-SWDM 850nm MMF QSFP28 Transceiver

SKU: NSB-5959
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Dell S5296F-ON EMC S 96x 25GB SFP28 8x 100GB QSFP28 F-B Air (No OS10) Switch

SKU: NSN-9938
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper QFX5200-48Y-DC-AFO 48x 25GB SFP28 6x 100GB QSFP28 F-B Air DC Switch

SKU: NSN-3634
Condition: New
Shipping: Overnight Options
Warranty: 365 days