There are reputable breeders still breeding, some people need working dogs, not just pets, and sometimes, admittedly rarely, you cannot wait.
Years ago, my working dog was unexpectedly diagnosed with a lift limiting illness with aggressive progression, and so I need to get a pup as soon as possible to learn from him and then take over his job when he passed.
It was a huge shock, I had planned to get a pup a few years from then to gradually take over OlderDogs duties, but had to speed up the timeframe. So it really isnt true to say theres no such thing as cant wait.
PoleDogs breeder, highly reputable, very respected, and with years of experience (Ive had four dogs from her over the last thirty years, shes become a good friend) has a litter expected any day now, all are going to working homes, but she doesnt sell to pet homes as the breed (Great Pyrs) just aren`t suitable for that.
So as PPs say, be careful, do your due diligence and take the time to search for the right dog and breeder for you, even if it takes longer.