The cheapest place in the world to buy scales seems to be EBAY.
Think postal scales, not kitchen scales - you kinda need them to be a serious ebay seller, so they're a big item (and competitively priced).
Mine happens to be Escali brand (got it quite a few years ago and that's what was hot then, but that brand seems more pricey now).
Just make sure it has tare, 0.1oz/1g increments. You are not looking for a very high top weight, it's better to have smaller increments.
I have a pizza dough recipe I weigh and use the same amount of stuff (flour, water, oil, salt, yeast) all year round and it always works. Only thing is I have to measure the salt and yeast by spoon because those small granules don't make much impact on my scale.
But if a scale meets postal standards, it's gonna work well in your kitchen too. Don't get pulled in by fancy things to hold the food. You can always tare out your plate or bowl.
Nancy