Your search for "Finisar FTLF8519" revealed the following:
Dell Finisar FTLF8519P2BNL 1GB BASE-SX 850nm 300m SFP Transceiver
SKU: NSB-5736
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 18.99
• 7 in stock
Call if you need more
NEW Dell Finisar FTLF8519P2BNL 1GB BASE-SX 850nm 300m SFP Optical Transceiver
SKU: NSN-9093
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 22.99
• Only 2 remaining
Call if you need more
Finisar FTLF8519P3BTL-TM 850nm LC 1 GB For T-Mobile Transceiver SFP
SKU: NSB-9936
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Finisar FTLF8528P3BCV-QL 8GB 850nm Multimode Datacom FC SFP+ Transceiver
SKU: NSN-7799
Condition: New
Shipping: Overnight Options
Warranty: 365 days