Your search for "force10 xfp" revealed the following:
Cisco DWDM-XFP-48.51 10GB BASE-DWDM 1548.51nm SMF XFP Transceiver
SKU: NSH-3780
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme 10G-XFP-SR 10GB BASE-SR 850nm LC MMF XFP Transceiver
SKU: NSN-5968
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco DWDM-XFP-38.98 10GB BASE-DWDM 1538.98nm SMF XFP Transceiver
SKU: NSH-3794
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days