Your search for "FP798" revealed the following:
Dell FP798 10GB BASE-SR/SW 850nm XFP Transceiver
SKU: NSB-9891
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 12.99
• Only 2 remaining
Call if you need more
NEW Dell FP798 10GB BASE-SR/SW 850nm XFP Transceiver
SKU: NSN-1325
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 25.99
• Only 1 remaining
Call if you need more