Your search for "qsfp28" revealed the following:

NEW nVidia Mellanox MCX515A-CCAT ConnectX-5 1x 100GB QSFP28 PCIe3.0 x16 NIC

SKU: NSN-1093
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Cisco N3K-C3132C-Z 32x 100GB QSFP28 Back-to-Front Airflow Switch

SKU: NSH-8346
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

Dell N3248TE-ON 48x 1GB RJ45 4x 10GB SFP+ 2x 100GB QSFP28 F-B Air OS6 Switch

SKU: NSB-8625
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW HPE Aruba JL704C 44x 25GB SFP28 6x 100GB QSFP28 F-B Airflow Switch w/ MACsec

SKU: NSN-2050
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Juniper QFX5120-32C-AFI 32x 100GB QSFP28 Back-to-Front Airflow Switch

SKU: NSH-9464
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 Mellanox MCP7H00-G002 2m 100GB QSFP28 to 2x 50GB QSFP28 Breakout Cable

SKU: NSN-8333
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N3K-C36180YC-R 48x 25GB SFP+ 6x 100GB QSFP28 Back-to-Front Air Switch

SKU: NSN-8254
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco N3K-C36180YC-R 48x 25GB SFP+ 6x 100GB QSFP28 F-B Airflow (DC) Switch

SKU: NSN-0237
Condition: New
Shipping: Overnight Options
Warranty: 365 days