Then you're out of luck. Scales that weigh over 400 grams aren't going to be cheap. I paid $25 for mine that weighs up to 5000 grams, but it eats batteries like their is no tomorrow. My aunt gave me hers, but it only weighs up to 2000 grams so I still have to use my old one for the big ones. You can get non digital ones for $5 at Walmart, but they only weigh up to 400 grams if I remember right.

The one from my aunt that I really like is Weigh of Life, not sure what my big one is, it's from Walmart though.