I am convert to the "buy quality and never buy it again". After getting stung at the post office by my weight not matching their weight, I decided to get a quality used scale. I went for a FAIRBANKS DIGITAL SCALE (70-2453-4). These are industrial scales from shipping departments. You can also get the roller top version, which oddly seems to have the same part number. I prefer the flat top version. 60 lb max capacity at 0.02 lb resolution. The footprint is 13" square. They will also weigh in Kg.
You can find them used for $35 to $45 + shipping on Ebay. Expect shipping not to be cheap ($30) since these are not light weight scales. But the added weight + rubber feet mean the scale does not move when you slide boxes on them. They are also made in USA.
Example auctions on Ebay (no affiliation):
FAIRBANKS DIGITAL SCALE (70-2453-4)
http://www.ebay.com/itm/Fairbanks-70-2453-4-Heavy-Duty-13x13-Digital-Shipping-Scale-Ball-Roller-Top-/112236596275