I can't give suggestions about WHERE to get your scales, but digital food ones that can measure in single gram measures as well as lb/oz is best. That way when a measure in a recipe is given, regardless of whether imperial or metric, you will know how much it is. Also, get one that measures larger quantities - some only measure up to only 3-4lb - mine go up to 5kg which is just over 11lb. MUCH better than the first scales I had.
As far as calibrating them is concerned, I sometimes check mine with the supermarket's scales when I buy meat. They are very precise and have to go through regular checks.
I have a set of good digital bathroom scales, but found that there are loads of variables to weighing, so hardly ever use them. Instead I just weigh when I go to my Medical Centre - always before lunch, after going to the bathroom, and with the same clothes on.
| current weight: 151.0