Your search for "qsfp28" revealed the following:
NEW Dell S4112F-ON-RA 12x 10GB SFP+ 3x 100GB QSFP28 B-F No OS10 Switch
SKU: NSN-9959
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell 407-BBTC 15FMD EMC S6100-ON 4x 100GB CXP 4x 100GB QSFP28 Switch Module
SKU: NSN-9927
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5120-48Y-DC-AFO 48x 25GB SFP+ 8x 100GB QSFP28 F-B Air (DC) Switch
SKU: NSN-3629
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme 100G-QSFP28-SR4 100GB BASE-SR4 850nm MMF QSFP28 Transceiver
SKU: NSN-6993
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell S5248F-ON 48x 25GB SFP28 2x 200GB QSFP28-DD 4x 100GB QSFP28 F-B OS10 Switch
SKU: NSH-9215
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5110-48S-DC-AFI 48x 10GB SFP+ 4x 100GB QSFP28 B-F Airflow (DC) Switch
SKU: NSH-8242
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell S4112T-ON 12x 10GB Copper 3x 100GB QSFP28 F-B Air AC (No OS10) Switch
SKU: NSB-9779
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N3K-C3636C-R 36x 100GB QSFP28 Front-to-Back Airflow Switch
SKU: NSN-3564
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5210-64C-DC-AFI 64x 100GB QSFP28 B-F Airflow (DC) Switch
SKU: NSH-8262
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista AOC-Q-Q-100G-10M 10m 100GB QSFP28 Active Optical Cable
SKU: NSN-5326
Condition: New
Shipping: Overnight Options
Warranty: 365 days