NZ $4.78 +GST each
The MPU6050 contains both a 3-Axis Gyroscope and a 3-Axis accelerometer allowing measurements of both independently, but all based around the same axes, thus eliminating the problems of cross-axis errors when using separate devices.
Accelerometer ranges: 2, 4, 8, 16g
Gyroscope ranges : 250, 500, 1000, 2000 /s
Voltage range : 3.3V - 5V (the module include a low drop-out voltage regulator)
Chipset : GY-521 MPU-6050
This simple module contains everything required to interface to the Arduino and other controllers via I2C (use the Wire Arduino library) and give motion sensing information for 3 axes - X, Y and Z.