Your search for "hpe sfp28" revealed the following:
Cisco N9K-C93180YC-EX-24 24x 25GB SFP28 6x 100GB QSFP28 F-B Airflow Switch
SKU: NSB-7728
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco N540-ACC-SYS NCS 540 24x 10GB SFP+ 8x 25GB SFP28 2x 100GB QSFP28 Router
SKU: NSB-8197
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista CAB-S-S-25G-5M 5m 25 Gigabit BASE-CR Twinax Copper Cable
SKU: NSN-7295
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Ruckus ICX8200-48PF ICX 8200 Series 48x 1GB PoE+ RJ45 4x 25GB SFP28 Switch
SKU: NSB-9719
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme 16701 X460-G2-24t-10GE4 28x 1GB RJ45 8x 1GB Combo 4x SFP+ Switch
SKU: NSN-5890
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Extreme 16701 X460-G2-24t-10GE4 28x 1GB RJ45 8x 1GB Combo 4x 10GB SFP+ Switch
SKU: NSH-8484
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista CCS-720XP-48ZC2-F 48x MultiGB PoE RJ45 4x SFP28 2x QSFP28 F-B Switch
SKU: NSN-4101
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW HPE AE311A ProLiant Single Channel 4Gb PCIe Fibre Host Bus Adapter
SKU: NSN-9061
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Fortinet FG-2201E 158 Gbps Registrable / Unclaimed Firewall
SKU: NSC-0212
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme 16567 210-12p-GE2 12x 1GB PoE RJ45 2x 1GB SFP Switch
SKU: NSN-4899
Condition: New
Shipping: Overnight Options
Warranty: 365 days