If you are looking for a young adult, then go to the BCOA and contact breeders near you. They may have or know of dogs. Also, there are 2 two-year-olds available as a pair (brother and sister) from a breeder on the east coast. As for rescues, I have had both rescues and breeder's dogs. I have not had any more issues with rescues from a good rescue than from good breeders. A good rescue has evaluated dogs for behaviors, as well as Fanconi testing. Camp Basenji in Florida has some really nice dogs. You can also check the BRAT page.
Right panel gives states:
http://www.basenji.org/index.php/about-basenjis/breeder-directory
http://www.campbasenji.org/ She does not have most of the dogs listed as she prefers to know the people and suggest ones that are good fits.
https://www.basenjirescue.org/dogs/default.asp