Your search for "qsfp28" revealed the following:
Dell Z9664F-ON Z-Series 64x 400GB QSFP56-DD Front-to-Back Airflow OS10 Switch
SKU: NSB-9792
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista AOC-Q-Q-100G-3M 3m 100 Gigabit QSFP to QSFP Active Optical Cable
SKU: NSN-5724
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco N9K-C9316D-GX Nexus 9300-GX 16x 400GB QSFP-DD B-F Airflow Switch
SKU: NSB-2125
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco C9200L-48PXG-2Y-E 48x 1GB PoE+ RJ45 (8x MultiGB) 2x 25GB SFP28 Switch
SKU: NSB-6099
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5110-32Q-AFO 32x 40GB QSFP+ Front-to-Back Airflow Switch
SKU: NSH-8245
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5110-32Q-AFO 32x 40GB QSFP+ Front-to-Back Airflow Switch
SKU: NSN-2375
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Extreme BR-SLX-9540-48S-AC-F 48x 10 Gigabit Ethernet SFP+ 6x 100G F-to-B Router
SKU: NSB-4935
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Fortinet FS-1048E 48x SFP+ 6x QSFP+ F-B Air Registrable / Unclaimed Switch
SKU: NSN-1235
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C92160YC-X 48x 25GB SFP+ 6x 40GB QSFP+ Front-to-Back Air Switch
SKU: NSN-8176
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Fortinet FG-1800F FortiGate 1800F Series 140 Gbps Local Management Only Firewall
SKU: NSB-0148
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days