If you post me privately, I can at least send you the addresses of the Breed Club secretaries but right now is NOT a good time to start looking for a Basenji unless you are dedicated enough, have done piles of research and manage to get onto a Breeder's waiting list for next year's crop.
This winter's puppies (as your research already will have shown you, Basenjis are once a year girls) are on the ground and starting to leave the nest - having been reserved months ago. Mating and whelping will start again in September 2021 in 99% of cases, pups being ready to be rehomed in February / March 2022.
We are just hoping there won't be too many opportunists breeding untested (for at least Fanconi and PRA) dogs.