I bought a digital postal scale on Ebay for $.99 and then paid $16 for shipping... the bottom line... a digital scale that goes to 35 lbs, in either g/kg or oz/lbs, accurate to within .1 oz, has a TARE feature, includes batteries and an A/C adapter. Brand new in the box for under $20. They are available by just looking up digital postal scale. I think the vendor I bought from was named something like "pounds and ounces" or something like that.
It works great, and I can not only weigh individual items, but also weigh my entire pack. Hope that helps.