What I would say about those crosses is you never know what you'll get. If you are looking for something specific I always recommend getting a full breed over a cross as its easier to know what you're getting. You must like Poodles to like those crosses, have you considered a Poodle? :wave:
If you do go ahead with a cross breed, you'd be best going on the appropriate forum to find a 'good' breeder. Some will say there's no good breeders of these crosses (the majority are out to make money by giving a dog a silly name). There are a few, and I mean a small few, who are in it because they love the breed and will have all the appropriate health tests done on each parent to ensure they are doing their best in bringing puppies into the world. These are vitally important. You may be able to find such breeders on those forums.
Would you be willing to rescue? Probably won't find those crosses are pups in rescue, but you may find others. Adult 'poo' crosses sometimes come up in rescue if you're set on them. I'm happy to suggest them, I just really don't like supporting the breeding of these dogs, as most are just into it to line their pockets.