Walmart and Target often have nice Kitchen scales that weigh up to 6 pounds (I've seen a few weigh up to 10), and can be set to weigh in grams, kilos, ounces, or pounds. Look for one that weighs in 1 gram increments.

They cost maybe $20 to $30.
I have this one: http://homecookingmemories.com/wp-co...-Cookies-1.jpg

It takes a beating. I bought it a couple of years ago, and I can't count how many times it's been dropped, had heavy things set on it, been thrown a box, etc.