There's only a few basenji breeders in the area:
Craigie, Nancy A., Flutesong, Hastings, 651-480-1133
Jones, Carrie, Ankhu, Eyota, 507-876-9987
Wuornos, Sally, Sonbar Basenjis, North Branch, 651.253.6784
I've met Nancy and Sally and they both have good stock (though basenji puppies are usually not available until late winter). I've never met Carrie.
You might also consider a basenji rescue, via BRAT (Basenji Rescue and Transport), http://www.basenjirescue.org/ but be sure to tell them you are new to the breed.
Be sure to consider the other aspects of basenji behavior besides the allergy part. As a breed they can be a "handful" even though they are on the small side; many rival Houdini as escape artists; they have extremely strong hunting instincts; and they don't particularly like being left alone with nothing to do.
On the other hand they can steal your hearts.
Generally breeders are willing to show you their dogs even if they don't have any available.