I bought this one a few months back ...http://www.amazon.com/American-Weigh-Bl ... B0012N1NAA
... and I really like it. It has great reviews on Amazon, free shipping (if you have Amazon prime), and there are two lids that fit over it that act as nice "containers" for putting the tea in after you tare it. It goes from 0.1 to 1000 grams, so weighing entire cakes/bricks is possible. It has a 10 year warranty and is powered by two AA batteries. Also, it is very portable and easy to transport (folds up into a nice square).
The only drawback was that it requires a 500g weight to calibrate it. I bought this from Amazon too ...http://www.amazon.com/American-Weigh-Sc ... pd_sim_k_4
... so the total came to ~$17.47 shipped. Not bad, especially since you'll never need to worry about calibration so long as you have the weight.