Cast your net world wide. We looked looked for ours when we were in Hawaii. And the mainland, none. So we got our basenji from NZ. Cost was $2000 in 1960 but he was worth it. Most cost was the plane transport of him. firstname.lastname@example.org
Looks like you are out of luck. Basenji's are escape artists. Could use your 3 ft wall and then build a 4 ft behind it only 2 ft apart??? Put a port hole in the inner fence so it can return to you side of the yard.