There are a lot of battery-powered digital scales on the market at affordable prices. Try to find one that has a tolerance to the nearest .01gm (100th) and is small enough that you can carry it to shows, shops, etc. Chris
Check out Old Will Knott Scales. They have just about every sensitivity you can get, in many different sizes. They have some very inexpensive options as well.
Welcome to CT. There are a few other threads that you can search for suggestions on digital scales, just use the 'Advanced Search' feature (top left of each page) to sort keyword results in the single content tab for best results. I use a Digiweigh pocket scale, and I bought mine for around $16 shipped from this seller on ebay: digiweigh-pocket-scales The scale came with two calibration weights as well. The seller was easy to work with, has a fair return policy, shipped promptly and the unit was securely packed. You can also acquire them and info about these scales from their web site: DigiWeigh Some other sites for scales: Old Will Knott scales and more sophisticated: Precision Weighing Balances (search for the MyWeigh scales here or on eBay) and one other: Dillion Precision
