Your search for "qsfp28" revealed the following:
NEW Juniper QFX5120-32C-AFI QFX5120 Series 32x 100GB QSFP28 B-F Airflow Switch
SKU: NSN-3712
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5210-64C-DC-AFI 64x 100GB QSFP28 B-F Airflow (DC) Switch
SKU: NSN-3637
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N9K-C92300YC 48x 25GB SFP+ 18x 100GB QSFP28 Front-to-Back Air Switch
SKU: NSN-8177
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Fortinet FS-3032E 3000 Series 32x 100GB QSFP28 F-B Local Management Only Switch
SKU: NSB-1411
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Mellanox MCX415A-CCAT ConnectX-4 1x 100GB QSFP28 PCI-E3x16 Card
SKU: NSB-2871
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell N3248TE-ON-RA 48x 1GB RJ45 4x 10GB SFP+ 2x QSFP28 B-F Air OS6 Switch
SKU: NSN-9970
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7280QR-C36-R 24x 40GB QSFP+ 12x 100GB QSFP28 B-F Airflow Switch
SKU: NSN-2362
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Mellanox MSN2410-CB2F 48x 25GB SFP28 8x 100GB QSFP28 B-F (P2C) Onyx Switch
SKU: NSN-9826
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Nvidia Mellanox MFA1A00-C030 30m 100GB QSFP28 Active Optical Cable
SKU: NSB-3135
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco N3K-C36180YC-R 48x 25GB SFP+ 6x 100GB QSFP28 F-B Airflow (DC) Switch
SKU: NSH-8369
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days