Where to look for reputable golden doodle breeders?

Hello! I'm looking into getting a golden doodle. I am just in the beginning research stages so I'm nowhere near ready to adopt at this moment in time - I'm totally fine with being on a waitlist and with taking my time to make sure the dog and breeder are a good fit for me. Ideally, I'd love to adopt a dog that's young but already potty trained. I'm also open to rescuing from a shelter if you have any recommendations for good shelters - but I know that golden doodles are a breed that would be much harder to find in a shelter. Thank you so much for your recommendations!