Your search for "SFP28-25G-SR-G2" revealed the following:
Dell SFP28-25G-SR-G2 W4GPP 25GB BASE-SR 850nm MMF SFP28 Transceiver
SKU: NSB-9879
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 48.99
• Only 2 remaining
Call if you need more
NEW Dell SFP28-25G-SR-G2 W4GPP 25GB BASE-SR 850nm MMF SFP28 Transceiver
SKU: NSN-0768
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 51.99
• Only 1 remaining
Call if you need more