I use an 'Ultraship Ultra-50' I bought a few years ago. Every so often I cross-check items weighed on the scale with the ones at the post office. Mine reads a little heavy (but only by about 10 grams) so that's fine by me. It'll handle up to 50lbs (22.5 kg). Can't remember where I got it or how much I paid but I know it was new from an eBay seller in the UK.
What you choose will depend on what you're shipping, who is going to use the equipment (you, or heavy-handed-couldn't-give-a-rat's-arse-about-the-bosses-property-employees) and how much work you expect the equipment to do.