Your search for "FET-10G" revealed the following:
Cisco FET-10G 10GB BASE-SR 850nm MMF LC SFP+ Transceiver
SKU: NSH-1570
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 12.99
• 7 in stock
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Cisco N2K-C2332TQ8F 32x 10GB Copper 4x 40GB QSFP+ Switch Fabric Extender
SKU: NSB-7743
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco N2K-C2348TQ4F 48x 10GB Copper 6x 40GB QSFP+ Switch Fabric Extender
SKU: NSN-9089
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco N2K-C2348TQ4F 48x 10GB Copper 6x 40GB QSFP+ Switch Fabric Extender
SKU: NSB-5488
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days