ESearch eBay for vintage Redding powder scales. I have an old black wrinkle finish scale that is nice and heavy, never needs batteries and is perfectly accurate. the best part is that it will never wear out! goes up to 350grains!
They start at about $25 and go up.
UPDATE 7/9/2015 8pm! There are about 15 of the Redding #1's on eBay starting at $19!
be safe
Just be aware, although the old Redding No 1 is an excellent and accurate scale it's not magnetically damped. Fine to just check your measure or compare your digital, but not very practical if you want to weigh evey load.