Well there is this FDA warning about using this psycotropic drug.
http://www.mcall.com/news/breaking/mc-nws-fda-issues-new-warnings-about-kratom-20180912-story.html
"It is banned in a number of states and municipalities in the U.S., but not in Pennsylvania, "
As to why some are listed and you are blocked, some people run red lights and don't get caught.
There are not 'a lot' of sellers. From the 60 or 70 listings I saw, there seem to be only about a dozen sellers with slight variations in their listings.
