Your search for "QSFP28" revealed the following:

Juniper MX240BASE-AC-HIGH MX Series Router Bundle w/ SCB

SKU: NSB-5457
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Cisco C9200L-24PXG-2Y-E 24x 1GB PoE+ RJ45 2x 25GB SFP28 Switch

SKU: NSB-6095
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Juniper QFX5110-32Q-DC-AFI 32x 40GB QSFP+ Back-to-Front Airflow (DC) Switch

SKU: NSH-8246
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco C9200L-48PXG-2Y-E 48x 1GB PoE+ RJ45 (8x MultiGB) 2x SFP28 Switch

SKU: NSN-7434
Condition: New
Shipping: Overnight Options
Warranty: 365 days

Extreme 16791 X590-24T-1Q-2C 24x 10GB Copper 1x 40GB QSFP+ 2x 100GB QSFP Switch

SKU: NSH-3357
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

HPE Aruba JL310A 100GB BASE-LR4 LC Long Reach SMF QSFP-100G Transceiver

SKU: NSB-5547
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Cisco C9200L-24PXG-2Y-E 24x 1GB PoE+ RJ45 2x 25GB SFP28 Switch

SKU: NSN-8239
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper QFX5110-32Q-DC-AFI 32x 40GB QSFP+ Back-to-Front Airflow (DC) Switch

SKU: NSN-3624
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Ruckus Brocade ICX7650-48F 24x 1GB SFP 24x 10GB SFP+ 4x 40GB QSFP+ Switch

SKU: NSN-7964
Condition: New
Shipping: Overnight Options
Warranty: 365 days

NEW Fortinet FS-1048E 48x SFP+ 6x QSFP+ F-B Air Local Management Only Switch

SKU: NSN-8457
Condition: New
Shipping: Overnight Options
Warranty: 365 days