Your search for "QSFP28" revealed the following:
NEW Nvidia Mellanox MCP1600-C003E26N 3m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSN-8575
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco UCS-FI-64108-U UCS 64108 36x 25G SFP28 4x 100G QSFP28 Fabric Interconnect
SKU: NSB-6667
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista AOC-Q-Q-100G-1M 1m 100GB QSFP28 Active Optical Cable
SKU: NSN-6738
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
Extreme 10423 3m 100GB QSFP28 to 4x 25GB SFP28 Direct Attach Breakout Cable
SKU: NSH-9414
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
Mellanox MCP1600-C003E26N 3m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSB-2910
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell S4148U-ON 210-ALRZ 48x 24x Unified SFP+ 2x QSFP+ 4x QSFP28 F-B OS10 Switch
SKU: NSH-9214
Condition: Seller refurbished
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
Dell S4148U-ON 210-ALRZ 48x 24x Uni SFP+ 2x QSFP+ 4x QSFP28 F-B No OS10 Switch
SKU: NSB-9786
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days