ADXL326 - 5V ready triple-axis accelerometer (+-16g analog out) : ID 1018 : $17.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Wishiot ADXL345 Digital Accelerometer Module IIC/SPI 3-Axis Inclination Tilt Sensor with 10Pin Female to Female/Female to Male Dupont Cable for Arduino Raspberry Pi (Pack of 2): Amazon.com: Industrial & Scientific
G-Link® -LXRS® Low-cost Integrated Accelerometer Node | MicroStrain by HBK