Are you looking for a pet only or a dog you can show too? If you're looking for an older pet Cocker, then Cocker Rescue may be able to help - you'll find the contacts
HERE. If you want an older Cocker with papers from a breeder, the best place to start would be the regional breed Clubs nearest to your area (Contacts
HERE. If you do want a dog to show, you'd find it easier if you got to know breeders first by attending some shows. Even then you'd need to be very patient

Good luck