THE CIMPLE CO - Thermostat Wire 18/8 -Brown- 18-Gauge Solid Copper 8-Conductor CL2/CMR - 100ft - Walmart.com
Buryeah Thermostat Wire Bell Wire Solid Copper Cable 18 Gauge ETL Electrical Wire, Power Circuit Cable Moisture, Heat and UV Resistant for Low Voltage Applications Use (18/2,25 ft): Amazon.com: Tools & Home