We got ours a Wal Mart. Doesn't have to be fancy, just accurate. Ours is digital.
I actually weigh myself every day. Usually you will see the fad diets ask that you not do that. Weighing daily forces me to keep on top of when I am being a little naughty in my tendency to over-eat. I can regulate myself faster than if I only weighed myself once every 10 days or so and then have to deal with a 5 pound weight gain.
I would think that if we set up the reports to be only once a month, we should at least weigh weekly so we can self-monitor. That's why I think we should report weekly, because there will be some weight losses to celebrate weekly! These losses will motivate others to do the same, I think!
What say you, oh other respected club members?