I wouldn’t buy a pup off someone just in it for the money. Even if I was lucky and it was healthy and well adjusted? What about the bitch and the ethical implications? Just so I have a cute cross
This. Why do people breed crosses? To sell. They’re not working dogs, or show dogs...
The chances of finding a reputable cross breeder are very slim. Especially when most people can’t see past “cute puppy” to engage their brains and see the red flags.
Add in the fact that there isn’t even KC standard or registration as a starting point for choosing a breeder. There are no records of litters.
If i want a crossbreed, where do i start? Where do i find a breeder? Internet would probably be first, small ads. If I’m lucky i may get word of mouth, but that may be no more than someone else who bought a cute puppy from a puppy farm without realising.
For my pedigree first stop was KC and champdogs. I compiled a list of breeders on the extra check list- no more than a certain amount of litters, dogs, health checks all recorded. That i cross checked with champdog records, found pedigrees and checked inbreeding coefficients. also checked they only had one breed. I’ve also had four of this breed before so i was specifically looking for a breeder who used lines related to the one with the best temperament.
Once i had a short list i started checking show results, and narrowed down breeders more. It also gave me a feel for the breeders lifestyle. And yes, i checked all their social media 
I may have scared the eventual lady i approached as i wrote a very long email outlining why and how i had chosen her. I think the reply said i’d answered all the questions she was going to ask!
Cross breeds simply aren’t that easy to research.