The number of herbs available has declined, fewer obscure North American plants are available ( Fringe tree for example), while there is greater availability of Ayurvedic herbs. Quality of organic herbs has improved, quality of Chinese herbs has declined. It is a very mixed bag, some improvements and some decreases in quality. Prices have skyrocketed. Sourcing means lot of due diligence, work with trusted growers, wildcrafters (many fewer wildcrafters these days), and suppliers. You need to do your own testing you cannot trust C of A’s. I am not sure what you mean by form of delivery ?