Amazon.com: 10Gtek 10GBase-T SFP+ to RJ-45 Transceiver, 10Gbe SFP+ Copper Ethernet CAT6a Module, up to 30-Meter, for Cisco SFP-10G-T-S, Meraki, Ubiquiti UniFi UF-RJ45-10G, Fortinet, TP-Link TL-SM5310-T and More : Electronics
SFPs 101: Fundamentals of Fiber Optic or Copper SFP Transceivers
1G Copper SFP
TRENDnet SFP to RJ45 1000BASE-T Copper SFP Module, TEG-MGBRJ, 100m (328 Ft.), RJ45 Connector, Hot Pluggable, Supports Data Rates Up to 1.25Gbps, IEEE 802.3ab Gigabit Ethernet - Newegg.com
100BASE-T Brocade compatible transceiver SFP 100M Copper
StarTech Gigabit RJ45 Copper SFP Transceiver Module - HP
Amazon.com: 6COM 10GBase-T SFP+ Copper Transceiver, 10G RJ45 Module, up to 30 Meters, Compatible for Intel E10GSFPT and Other Open Switches : Electronics