Your search for "hpe sfp28" revealed the following:
HPE JC772A 5900AF-48XG-4QSFP+ 5900 Series 48x 10GB SFP+ Switch
SKU: NSH-3596
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 149.99
• 5 in stock
Call if you need more
HPE J9143B 1GB BASE-BX-U 1310nm / 1490nm SMF LC SFP Transceiver
SKU: NSH-4876
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 429.99
• Only 2 remaining
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NEW HPE J4860C X121 1GB BASE-LH 1550nm SMF SFP Transceiver
SKU: NSN-2852
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 544.99
• Only 2 remaining
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HPE Aruba JL309A 100GB BASE-SR4 MPO MMF Optical QSFP28 Transceiver
SKU: NSB-5546
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 263.99
• Only 2 remaining
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NEW HPE JG305A 48x FE RJ45 2x 1GB RJ45 4x 1GB SFP Switch
SKU: NSN-2013
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 636.99
• Only 1 remaining
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HPE JD118B 1GB BASE-SX LC MMF 850nm SFP Transceiver
SKU: NSH-4883
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 12.99
• Only 3 remaining
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HPE JH180A FlexFabric 5930 Series 24x 10GB SFP+ 2x 40GB QSFP+ Switch Module
SKU: NSB-9726
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 99.99
• Only 2 remaining
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HPE J9584A 3800 Series 3800-24SFP-2SFP+ 24x 1GB SFP 2x 10GB SFP+ Switch
SKU: NSH-3582
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 189.99
• Only 1 remaining
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HPE 180-200040 8GB Fibre Channel 850nm SW SFP+ Transceiver
SKU: NSB-3942
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 12.99
• 22 in stock
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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
Call if you need more