Smraza Ultrasonic Sensor for Arduino, HC-SR04 Distance Sensors with 8pcs Mounting Bracket for Arduino R3 Compatible with MEGA2560 Nano Robot XBee ZigBee, Set of 8 S03-CN : Amazon.ca: Electronics
5pcs HC-SR04 Ultrasonic Sensor, Distance Sensor with Ultrasonic Transmitter and Receiver Module fit Arduino UNO MEGA2560 Nano Robot XBee ZigBee : Amazon.ca: Industrial & Scientific
Multi-function 4WD Robot Car Kits Ultrasonic Module UNO R3 Assembly For Arduino | eBay
Multi-function 4WD Robot Car Kits Ultrasonic Module UNO R3 Assembly For Arduino | eBay