It's not often that reputable breeders, especially of uncommon breeds, have unclaimed puppies ready to leave for new homes. I'd suggest waiting just a bit more. A little wait now will prevent any heartache later on.

Wheatens aren't terribly unpopular, either. Since the recent surges of "Wheaten-Poos", Wheaten themselves have risen in popularity (especially since they are widely recommended for people with fur allergies).

ETA: I also agree with going to a local show. You'll find a myriad of Wheaten breeders there.