I bought a Weighmax 2822. Here is a link from amazon for the one I got.
Amazon.com: Weighmax 2822-75LB postal shipping scale, Battery and AC Adapter Included: Office Products

If you search scales you can find a lot of posts of people talking about their different kinds of scales. I read through those until I decided on this one and it has done all I ask for it. If you want a bigger one there are lots of other recommendation and model numbers in those threads.