I have searched multiple puppy/dog finding sites, the problem is the vast majority are likely puppy mills or are older dogs/mixes. For a variety of reasons, they want a full wheaten puppy. They're continuing to contact breeders identified as reputable, but as you say, they are not common dogs so it will take awhile to identify another puppy.

I thought that since this was such a widely read site, someone might know of a reputable Wheaten breeder who had an unclaimed puppy.

Jake's mom