Your search for "qsfp28" revealed the following:

NEW Dell Q28-100G-BIDI 100GB Bi-Di Short-Reach 150m MMF QSFP28 Transceiver

SKU: NSN-2283
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco C9200-NM-2Q Catalyst 9200 2x 40GB QSFP28 Switch Module

SKU: NSN-0400
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Dell S5248F-ON-RA 48x 25GB SFP 2x 200GB QSFP28-DD 4x QSFP B-F OS10 Switch

SKU: NSN-8138
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Dell S5296F-ON EMC S 96x 25GB SFP28 8x 100GB QSFP28 F-B Air OS10 Switch

SKU: NSN-1911
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Arista CAB-Q-4S-100G-1M 1m 100GB QSFP to 4x 25GB SFP28 DA Breakout Cable

SKU: NSN-7153
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Cisco N9K-X9636C-RX 36x 100GB QSFP28 Switch Line Card w/ Additional TCAM

SKU: NSB-7707
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Dell S4148FE-ON-RA 48x 10GB SFP+ 2x 40GB QSFP+ 4x 100GB QSFP28 B-F OS10 Switch

SKU: NSB-6543
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Arista CAB-Q-4S-100G-1M 1m 100GB QSFP to 4x 25GB SFP28 DA Breakout Cable

SKU: NSB-5253
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Dell S4148F-ON-RA 210-ALSR 48x SFP+ 4x QSFP28 2x QSFP+ B-F Air OS10 Switch

SKU: NSN-8123
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Dell S5224F-ON-RA 24x 25GB SFP28 4x 100GB QSFP28 B-F Air No OS10 Switch

SKU: NSN-9949
Condition: New
Shipping: Overnight Options
Warranty: 365 days