Your search for "QSFP28" revealed the following:
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
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 Arista AOC-Q-Q-100G-10M 10m 100GB QSFP28 Active Optical Cable
SKU: NSN-5326
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco Meraki MS450-12-HW 12x 40GB QSFP+ 2x 100GB QSFP28 Unclaimed Switch
SKU: NSN-3730
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Nvidia Mellanox MCP1600-C003E30L 3m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSB-0919
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista AOC-Q-Q-100G-15M 15m 100GB QSFP28 Active Optical Cable
SKU: NSN-5324
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Amphenol SF-NDAAFF100G-001M 1m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSB-0899
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Nvidia Mellanox MCP1600-C001E30N 1m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSB-2905
Condition: Seller refurbished
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 Arista CAB-Q-4S-100G-3M 3m 100GB QSFP to 4x 25GB SFP28 DA Breakout Cable
SKU: NSN-6232
Condition: New
Shipping: Overnight Options
Warranty: 365 days