Your search for "SFP-10G-LR-C" revealed the following:

ProLabs for Cisco SFP-10G-LR-C 10GB BASE-LR 1310nm SMF LC DOM SFP+ Transceiver

SKU: NSB-0570
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Arista SFP-10G-DZ-T 10GB BASE-DWDM Duplex SMF Tunable SFP+ Transceiver

SKU: NSB-5373
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

Arista SFP-10G-DZ-T 10GB BASE-DWDM Tunable SFP+ Transceiver

SKU: NSB-7190
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Arista SFP-10G-DZ-T 10GB BASE-DWDM Duplex SMF Tunable SFP+ Transceiver

SKU: NSN-5308
Condition: New
Shipping: Overnight Options
Warranty: 365 days