Wiitek SFP+ to RJ45 Copper Modules, 10GBase-T Transceiver Compatible for Cisco SFP-10G-T-X, Ubiquiti, Netgear, Mikrotik, Unifi (Cat 6a/7 or Better, 30-Meter), Backward Work for 5GBase-T, 2.5GBase-T - Newegg.com
10GBase-T SFP+ to RJ45 Copper Transceiver SFP Module for Cisco SFP-10G-T-S 10Gb | eBay
Amazon.com: 100/1000BASE-T Copper SFP to RJ45 Module, Auto-Negotiation Gigabit Mini-GBIC RJ45 SFP Transceiver, Compatible for Cisco GLC-T(10/100/1000), SFP-GE-T(10/100/1000Mbps), up to 100-Meters Over Cat5e : Electronics