Your search for "qsfp28" revealed the following:
Dell S5232F-ON EMC S 32x 100GB QSFP28 2x 10GB SFP+ Front-to-Back Air OS10 Switch
SKU: NSH-9217
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5120-48Y-AFO 48x 25GB SFP+ 8x 100GB QSFP28 F-B Air Switch
SKU: NSN-3627
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C92304QC 56x 40GB QSFP+ 8x 100GB QSFP28 Front-to-Back Air Switch
SKU: NSN-8178
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S5232F-ON 32x 100GB QSFP28 2x 10GB SFP+ Front-to-Back Air OS10 Switch
SKU: NSN-7725
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
Fiberstore Q-4S28PC02 2m 100GB QSFP28 to 4x 25GB SFP28 Breakout Cable
SKU: NSB-1322
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper JNP-QSFP-100G-LR4 100GB BASE-LR4 1310nm SMF QSFP28 Transceiver
SKU: NSN-2071
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C9364C Nexus 9000 64x 100GB QSFP28 2x 10GB SFP+ B-F Air Switch
SKU: NSN-0366
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX10000-30C-M QFX 10000 30x 100GB QSFP28 MACsec Switch Line Card
SKU: NSN-3770
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C93180YC-EX-24 24x 25GB SFP28 6x 100GB QSFP28 F-B Airflow Switch
SKU: NSN-0607
Condition: New
Shipping: Overnight Options
Warranty: 365 days