First, use the Basenji Club of America for starters. Then, ask those breeders if they don't have an upcoming litter, can they recommend someone.
Next, when you get the sire/dam of an upcoming litter or one on the ground, come back with the names and we can help you look at testing and titles. Failure to do all the basic testing is a sure sign of a bad breeder. Selling online with credit cards to anyone who has the money-- another bad sign.
There are great breeders with lousy websites, btw. They are well known, puppy homes lined up, and web pages more annoying than helpful beyond basics. But on a web page, if they talk about their girls and boys, praise temperament etc, but do NOT have pedigrees and health testing touted, titles and a contract required, run. If they breed more than 2 breeds, have multiple litters for sale, you pick your puppy, all bad signs.