www.basenji.org you can search for breeders by state. There is also a link on how to "vet" breeders, question you should ask. https://www.basenji.org/learn/ScreeningBreeders.htm
Also check out health testing yourself. You need to have the registration numbers and/or registration name and you can check at www.ofa.org
Here is the link for questions to ask breeders. Do not just "take" their word for testing, check it out for yourself. Here is a link to one of my girl with her health testing results https://www.ofa.org/advanced-search?f=sr&appnum=1415062