It is a little late in the year to be looking for fresh ginseng.
For most of us our digging season ended a month or more ago (ginseng tops die back in the fall, usually Mid October here where I live, earlier in some places).
Most would only have dry ginseng at this point and only those who have not sold this years harvest yet. Many have sold by now.
If you really need a lot of fresh ginseng, you should get started asking for it around the first of September, or a little earlier. For most of us the digging season starts Sept 1 but there are a few States where that is different.
I take a little fresh ginseng myself, but I also keep several nice older ball roots with long necks that I dry and then grind and eat them that way. I have found both forms (green and dry) to be the same benefit health wise. Slices of dry root, or ground root, when put in a nice hot cup of green tea... after a few minutes they taste just like fresh root (except tea flavored). I love it like that.
Good Luck !