Your search for "QSFP28" revealed the following:
NEW Juniper EX-UM-2QSFP-MR EX4300 Series 2x 40GB QSFP+ Switch Module
SKU: NSN-4692
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper MIC-MRATE MX2000 Series 12x MultiRate QSFP+/28 Router Module
SKU: NSN-3766
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Arista DCS-7060CX-32S-F HPE JH576A 32x 100GB QSFP28 2x 10GB SFP+ F-B Air Switch
SKU: NSH-7470
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco C9600-LC-24C C9600 24x 40GB QSFP Switch Line Card
SKU: NSN-3705
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Arista DCS-7280TRA-48C6-R 48x 10GB RJ45 6x 100GB QSFP28 AM B-F Switch Router
SKU: NSB-5389
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco Meraki MA-CBL-100G-50CM 0.5m 100GB QSFP28 Stacking Cable for MS450 MS355
SKU: NSB-6448
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7280CR3-32P4-F 32x 100GB QSFP28 4x 400GB OSFP F-R Switch Router
SKU: NSN-6435
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX10000-60S-6Q 60x 10G SFP+ 6x 40GB QSFP+ 2x 100GB Switch Line Card
SKU: NSN-3733
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N540X-16Z4G8Q2C-D NCS 540 Series DC Router
SKU: NSN-8375
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell Z9664F-ON Z-Series 64x 400GB QSFP56-DD Front-to-Back Airflow OS10 Switch
SKU: NSB-9792
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days