@gianna - Note also that most all Basenjis are born in the winter months, it is very rare that there are litters in the spring/summer. Basenjis only come in season once a year and typically all around the same time.
The Basenji Klub Deutschland has a website - otherwise, email me privately for some addresses. You could be too late for this season's crop though you can get on a list for next winter.
Please go to basenji club of america for a list of breeders. If a breeder is not listed there, you can be pretty sure they are not a responsible breeder.
http://www.basenji.org/index.php/about-basenjis/breeder-directory
The Basenji Meetup in New York City has a list of breeders who provided dogs to members. You can find it at: http://www.meetup.com/basenji-nyc/pages/Breeders/.