Smraza 5pcs Ultrasonic Module HC-SR04 Distance Sensor with 2pcs Mounting Bracket for Arduino R3 MEGA Mega2560 Duemilanove Nano Robot XBee ZigBee: Amazon.com: Industrial & Scientific
Amazon.com: Ardest Measuring Module Ranging Ultrasonic Distance Sensor for Obstacle Avoidance in Arduino Projects Pack of 2 by Ardest : Industrial & Scientific
AZDelivery Compatible with HC-SR04 Ultrasonic Rangefinder Sensor Module compatible with Arduino and Raspberry Pi including E-Book! : Amazon.co.uk: Computers & Accessories
ERH India (1 Pc) HC-SR04 Ultrasonic Sensor Distance Module for Arduino Uno and All Type of Devlopment Boards and Robots : Amazon.in: Industrial & Scientific
Amazon.com: Ardest Measuring Module Ranging Ultrasonic Distance Sensor for Obstacle Avoidance in Arduino Projects Pack of 2 by Ardest : Industrial & Scientific