DataNab LLC has been providing affordable Programmable Automation Controllers and Temperature & Humidity Sensors for HVAC, Building Automation, Remote Monitoring, and other applications since 2003.
DS18B20 (3-wire) non-parasitic sensors
DataNab offers these 1-wire temperature sensors that use the DS18B20 chip wired in 3-wire mode. (3rd wire is dedicated power wire Vdd.)