Amazon offers Prime members the Nintendo Wii U Fit Meter for $10 with free shipping. (Non-members can get free shipping with orders of $35 or more; otherwise, shipping adds $4.98.) That's tied last week's expired mention as the lowest total price we've seen. (It's a current low by $12.) It features a 3-axis accelerometer and measures the amount of steps you've taken plus the number of calories you've burned. The data collected can be transferred to the Wii U via the IR port on the gamepad.