Your search for "hpe sfp28" revealed the following:
HPE J9309A 5400zl Series 4x 10GB SFP+ Switch Module
SKU: NSH-1157
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 91.99
• 12 in stock
Call if you need more
NEW HPE J4859C X121 1GB BASE-LX 1310nm Long Haul SMF LC SFP Transceiver
SKU: NSN-9492
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 51.99
• Only 2 remaining
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NEW HPE JC784C 7m 10GB SFP+ Direct Attach Copper Cable
SKU: NSN-5772
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 182.99
• Only 2 remaining
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HPE JL829A FlexNetwork 5140 EI Series 48x 1GB RJ45 4x 10GB SFP+ Switch
SKU: NSB-8361
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 1,653.99
• Only 2 remaining
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NEW HPE JL223A 48x 1GB RJ45 4x 10GB SFP+ 2x 40GB QSFP Arm ONIE F-B Air Switch
SKU: NSN-0106
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 3,262.99
• Only 2 remaining
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NEW HPE JD332A 3600 SI Series 48x FE RJ45 4x 1GB SFP Switch
SKU: NSN-3151
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 619.99
• Only 2 remaining
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HPE J9576A 3800 Series 3800-48G-4SFP+ 48x 1GB RJ45 4x 10GB SFP+ Switch
SKU: NSH-3585
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 149.99
• Only 2 remaining
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HPE QK724A 16GB SW LC Fibre Channel SFP+ Transceiver
SKU: NSB-0147
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 12.99
• 117 in stock
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HPE JQ076A FlexFabric 5945 Series 4x Expansion Module Slots 2x 1GB SFP Switch
SKU: NSB-0395
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 13,125.99
• Only 1 remaining
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HPE J4858C 1GB BASE-SX 850nm LC MMF Optical SFP Transceiver
SKU: NSH-0577
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 13.99
• 46 in stock
Call if you need more