However, their precision in that price range is a little lacking.
Not sure why you think that. Think you can do better ?
I think that the precision on a $10 scale is a little lacking because I require 0.005 gram precision and the $10 scales I found provide 0.1g or 0.05g precision. The precision offered is insufficient for my needs. I also need high repeatability, and the cheap scales either had poor or no specs. Is the lack of precision due to the structure of the load cell or a limitation of the controlling ICs-- I don't know. But since I found a $7 load cell as a component with known specs and that meets my requirements, I think that's a better option than going with an unknown salvage.
Do I think I can make a more precise load cell for that price? Nope. I don't even care to try.