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

$ 551.99

• Only 2 remaining
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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

$ 2,702.99

• Only 2 remaining
Call if you need more