Your search for "QSFP28" revealed the following:
NEW Cisco N3K-C3132C-Z 32x 100 Gigabit QSFP28 Front-to-Back Airflow Switch
SKU: NSN-8215
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper JNP-100G-AOC-5M 5m 100GB QSFP28 Active Optical Cable
SKU: NSN-4717
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
NEW Cisco C9200-NM-2Q Catalyst 9200 2x 40GB QSFP28 Switch Module
SKU: NSN-0400
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S4148U-ON-RA 48x (24x Unified) SFP+ 2x QSFP+ 4x QSFP28 B-F No OS10 Switch
SKU: NSB-9787
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S5232F-ON-RA 32x 100GB QSFP28 2x 10GB SFP+ B-F Air No OS10 Switch
SKU: NSN-9943
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper JNP-QSFP-100G-CWDM 100GB BASE-CWDM4 1330nm SMF QSFP28 Transceiver
SKU: NSH-9974
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper JNP-100G-DAC-3M 3m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSN-6065
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Arista AOC-Q-Q-100G-20M 20m 100GB QSFP28 Active Optical Cable
SKU: NSB-5270
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