Your search for "qsfp28" revealed the following:
NEW Juniper PTX10K-LC1101 PTX 10000 Series 30x 100G QSFP28 Router Line Card
SKU: NSN-4155
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7500R2A-36CQ-LC 7500R Series 36x 100GB QSFP28 Switch Line Card
SKU: NSN-9200
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Arista AOC-Q-Q-100G-15M 15m 100 Gigabit QSFP28 Active Optical Cable
SKU: NSB-5268
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
HPE Aruba JL709C 8360-12C v2 12x 100GB QSFP28 Back-to-Front Airflow Switch
SKU: NSB-9702
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
SuperMicro SSE-C3632S 32x 100GB QSFP28 Front-to-Back Airflow Switch
SKU: NSB-7203
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco NCS-5001 NCS 5000 Series 40x 10GB SFP+ 4x 100GB QSFP28 Router
SKU: NSH-9287
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco C9500-32C-E Catalyst 9500 32x 100GB QSFP28 Front-to-Back Airflow Switch
SKU: NSH-8328
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell N3248P-ON-RA 48x 1GB PoE RJ45 4x 10GB SFP+ 2x 100GB QSFP28 B-F OS6 Switch
SKU: NSB-9804
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Arista DCS-7280SR2-48YC6-F 48x 25GB SFP28 6x 100GB QSFP28 F-B Airflow Switch
SKU: NSH-8383
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7280SR-48C6-M-R 48x 10GB SFP+ 6x 100GB QSFP28 B-F Airflow Switch
SKU: NSN-0397
Condition: New
Shipping: Overnight Options
Warranty: 365 days