1.25G SFP Transceiver 1000Base-LX, 1310nm SMF, up to 10 km, for Cisco GLC-LH-SMD, Meraki MA-SFP-1GB-LX10, Ubiquiti, Mikrotik, D-Link, Supermicro, Netgear and More. - Walmart.com
SFP 1g Wdm 20km SMF Ddm Optical Transceivers Single Fiber Mini GBIC SFP Modules for Mikrotik Cisco Huawei Compatible Sc Connector - China Simplex, SFP Module | Made-in-China.com
ST MASFP1GBSXST: SFP - Cisco Meraki MA-SFP-1GB-SX Comp at reichelt elektronik
US$ 14.99 - 1Gb Mini Gbic Single Mode Duplex SFP Module LC Compatible Cisco/Mikrotik Switch GLC-LH-SM 20/40/80/120KM - m.alusc.com
A Brief Introduction to Cisco Single-Mode SFP ModulesFiber Optic Components
Cisco Transceiver Modules - Cisco SFP Modules for Gigabit Ethernet Applications Data Sheet - Cisco