Your search for "SFP-10G-ER-S" revealed the following:
Cisco SFP-10G-ER-S 10GB BASE-ER Extended Reach SMF Optical SFP+ Transceiver
SKU: NSH-8088
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 185.99
• Only 2 remaining
Call if you need more
NEW Cisco SFP-10G-ER-S 10GB BASE-ER SMF Optical SFP+ Transceiver
SKU: NSN-1475
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 185.99
• Only 2 remaining
Call if you need more