I just bought a set of scales from here: http://aunet.com.au/today.htm
The weigh up to 30 kg in 1g increments, and are plug in rather than battery powered. The best thing about them tho is the price - they're currently on sale for $82.50 instead of $165. They have other fancy abilities, but I wasn't so worried about them. They just arrived today, and are a decent size, as well.