You should expect to spend 10-20$/€ on a decent scale. Costlier scales often offer specific features, but in general use they’re comparable.
A scale accurate to a gram can be a bit loose for ingredients like agar, cream of tartar, gelatin, etc. That said, my nearly decade old home scale is only accurate to the gram and I don’t plan to replace it. Scales accurate to a tenth of a gram are pretty common at reasonable prices at this point.
L