Don't buy ginseng from 许氏. Their quality may be good a long time ago. However, I've heard from two sources that they import ginseng from Canada and pretend they're Wisconsin ginseng. The ginsenoside content is much lower in Canada ginseng. I've heard positive reviews for https://www.schumacherginseng.com though I' ve never bought any from them. You can try http://www.marathonginseng.com/ too. Some people recommended that to me. However, ginseng can be good or bad to cancer patients. Please do some research first. It doesn't hurt to buy ginseng first and decide whether to use it later, if time is an issue. Best wishes to your father.