Your search for "qsfp28" revealed the following:
NEW Mellanox MCP7H00-G002 2m 100GB QSFP28 to 2x 50GB QSFP28 Breakout Cable
SKU: NSN-8333
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX5110-48S-AFI 48x 10GB SFP+ 4x 100GB QSFP28 Back-to-Front Air Switch
SKU: NSH-8240
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell Q28-100G-BIDI 100GB Bi-Di Short-Reach 150m MMF QSFP28 Transceiver
SKU: NSB-5963
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4128F-ON 210-ALSY 28x 10GB SFP+ 2x 100GB QSFP28 F-B Air OS10 Switch
SKU: NSN-2200
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco C8500-12X4QC 12x 10GB SFP+ 2x 40GB QSFP+ 2x 100GB QSFP28 Edge Platform
SKU: NSB-7862
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Juniper JNP-100G-4X25G-1M 1m 100 GB QSFP28 to 4x 25GB SFP+ Breakout Cable
SKU: NSH-9697
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Extreme 100G-QSFP28-SR4 100GB BASE-SR4 850nm MMF QSFP28 Transceiver
SKU: NSB-5759
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4148U-ON-RA 48x (24x Unified) SFP+ 2x QSFP+ 4x QSFP28 B-F OS10 Switch
SKU: NSN-8126
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4148U-ON-RA 48x 24x Unified SFP+ 2x QSFP+ 4x QSFP28 B-F No OS10 Switch
SKU: NSN-9963
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper JNP-QSFP-100G-CWDM 100GB BASE-CWDM4 SMF QSFP28 Transceiver
SKU: NSN-4927
Condition: New
Shipping: Overnight Options
Warranty: 365 days