Amazon.com: SFP Copper RJ45 Transceiver Gigabit Module 10/100/1000Base-T with Gigabit Ethernet Single Mode Dual SC Fiber, Mini 1x 10/100/1000Base-T RJ45 to 1x 1000Base-LX SFP Slot Ethernet Media Converter : Electronics
Gigabit Ethernet Media Converter, MultiMode Dual LC Fiber to Ethernet RJ45 Converter for 10/100/1000Base-Tx to 1000Base-SX(with a SFP MMF 850-nm Module), UL Certified, up to 550-m - Newegg.com
Amazon.com: Gigabit Multi-Mode LC Fiber to Ethernet Media Converter with A SFP SX Module, 1.25G Fiber to Copper RJ45 Media Converter, 1000Base-SX to 10/100/1000Base-TX, MMF, Transmission up to 550 meters/1804 ft