I have a Fitbit Aria for sale. This is the original model. It syncs over 802.11b (WPA2). Uses four AA batteries. Working order - just upgrading to a Withings model. The photo below is stock (no, I don't weigh 150 Kg at the moment). Shows weight and BMI. Recognises up to eight people (each with their own Fitbit account if needed, otherwise will show as "Guest").
Asking $65 incl shipping.