Where in the US can you purchase a Mekong Bobtail kitten?

The information in your request is incorrect. According to the IUCN Red List, the Mekong bobtail is an endangered species native to Southeast Asia and listed as protected under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). As a result, it's illegal to own, sell, or trade Mekong bobtail kittens or their fur in most parts of the world, including the United States.