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 QFX5210-64C-DC-AFI 64x 100GB QSFP28 B-F Airflow (DC) Switch
SKU: NSH-8262
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
NEW Cisco N9K-X9736C-EX Nexus 9700 Series 36x 100GB QSFP28 Switch Line Card
SKU: NSN-0716
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C93180YC-EX-24 24x 25GB SFP28 6x 100GB QSFP28 F-B Airflow Switch
SKU: NSN-0607
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Dell S4148U-ON 48x 24x Uni SFP+ 2x QSFP+ 4x QSFP28 F-B No OS10 Switch
SKU: NSN-9962
Condition: New
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
Juniper QFX5200-32C-DC-AFI 32x 100GB QSFP28 Back-to-Front Airflow (DC) Switch
SKU: NSH-8254
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Nvidia Mellanox MCP1600-C003E30L 3m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSN-8336
Condition: New
Shipping: Overnight Options
Warranty: 365 days
nVidia Mellanox MCX555A-ECAT ConnectX-5 1x 100GB QSFP28 PCIe3.0x16 NIC
SKU: NSB-9037
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days