Yvonne, I have a PACT I got from Midway for $100 and it is quite good.
I have one of those shirt-pocket $15 MTM jobbies I got from Precision, and it is quite good.
The secret to any digital scale is to check them often, zero them, set on a solid, flat base out of an air current, and let them 'warm up' before use.
I have good balance scales, too, but I find I use them more nowadays to do random checks of the digitals.
Bob