I don't know any breeders in NJ, but if you're going to spend some money on a puppy and want to reduce the chances of a health problem down the line, here's something to consider.
There are genetic diseases common to some breeds of dog. The cockapoo, as a mix of cocker and poodle, is at particular risk for those diseases common to cockers and poodles.
For cockers:
cherry eye, cataracts, glaucoma, progressive retinal atrophy and hemophilia.
Cockers are also prone to ear infections and seborrhea (greasy, flaky skin
For poodles:
Addison's,Gastric Dilatation-Volvulus (Bloat), Cushings, Epilepsy,
Hip Dysplasia, Hypothyroidism, Legg-Calve-Perthes, Patellar Luxation, progressive retinal atrophy, Optic Nerve Hypoplasia, Sebaceous Adenitis (SA), Von Willebrand's disease
It's worth knowing this in advance. Some of these problems can be screened out of a breeding program (no good breeder will knowingly reproduce dogs with severe Hip Dysplasia, for example; a good breeder will be able to prove to you that their puppies' parents passed hip screening checks.
I would be particularly careful of eye and ear problems, as both breeds have a problem with progressive retinal atrophy, and Cockers are notorious for having ear problems.
I don't mean to scare you, just that you should get your money's worth when you buy a puppy from a breeder. Get a buyer's contract that they'll take the puppy back for any reason (something a reputable breeder will do) and that they'll refund your money if, for instance, the puppy has heartworm or something else that their care should have prevented.
Good luck with finding a dog! There are many NJ rescue groups which specialize in small dogs, so if you're interested in adoption, that's also an option.