Your search for "SFP-10G-ER" revealed the following:
Cisco C3KX-SM-10G Catalyst 3750X 2x 10GB SFP+ Switch Module
SKU: NSH-1224
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 28.99
• Only 2 remaining
Call if you need more
HPE JG234A 10GB BASE-ER LC SMF Optical SFP+ Transceiver
SKU: NSH-4887
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 612.99
• Only 2 remaining
Call if you need more
NEW Ericsson RDH10265/2 10GB BASE-LR 1310nm FTLX1370W4BTL-E7 SFP+ Transceiver
SKU: NSN-2911
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 27.99
• Only 2 remaining
Call if you need more
Ericsson RDH10265/2 1310nm 10GB BASE-LR FTLX1370W4BTL-E7 SFP+ Transceiver
SKU: NSB-9480
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 22.99
• 5 in stock
Call if you need more
Arista SFP-10G-ER 10GB BASE-ER 1550nm SMF LC Optical SFP+ Transceiver
SKU: NSB-5371
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell SFP-10G-ER 6K3Y6 10GB BASE-ER 1550nm SMF LC Transceiver
SKU: NSN-0818
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco SFP-10G-ER 10GB BASE-ER Extended Reach SMF Optical SFP+ Transceiver
SKU: NSN-1733
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Dell SFP-10G-ER 6K3Y6 10GB BASE-ER 1550nm SMF LC Transceiver
SKU: NSB-5928
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco ONS-SC+-10G-ER 10GB BASE-ER 1550nm SMF LC SFP+ Transceiver
SKU: NSN-2778
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Cisco ONS-SC+-10G-ER 10GB BASE-ER 1550nm SMF LC SFP+ Transceiver
SKU: NSH-7582
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days