Your search for "qsfp28" revealed the following:
NEW HPE Aruba JL624A 48x 25GB SFP28 8x 100GB QSFP28 Front-to-Back Airflow Switch
SKU: NSN-3639
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QSFP-100GBASE-SR4 100GB BASE-SR4 850nm MMF QSFP28 Transceiver
SKU: NSN-4077
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco N3K-C36180YC-R 48x 25GB SFP+ 6x 100GB QSFP28 B-F Airflow (DC) Switch
SKU: NSH-8368
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW HPE Q9E63A M-Series SN2010M 18x 25GB SFP28 4x 100GB QSFP28 B-F Air Switch
SKU: NSN-0072
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Mellanox MFA1A00-C005 5m 100GB QSFP28 Active Optical Cable
SKU: NSN-8986
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C93180YC-EX-24 24x 25GB SFP28 6x 100GB QSFP28 B-F Airflow Switch
SKU: NSN-0453
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Mellanox MCP1600-C005E26L 5m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSB-2914
Condition: Seller refurbished
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
Nvidia Mellanox MSN2100-CB2F 16x 100GB QSFP28 Back-to-Front (P2C) Onyx Switch
SKU: NSB-6761
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C9336C-FX2 36x 100GB QSFP28 Back-to-Front Airflow Switch
SKU: NSN-2056
Condition: New
Shipping: Overnight Options
Warranty: 365 days