First off you need to understand what a Quitclaim deed is. Most of the deeds in NJ are Bargain and Sale CVG and we loosely see the QuitClaim deeds. A term used in property law to describe a document by which a person (the "grantor") disclaims any interest the grantor might have in a piece of real property, and passes that claim to another person (the grantee). A quitclaim deed neither warrants nor professes that the grantor's claim is actually valid. By comparison, a grant deed (or in some U.S. States, a warranty deed), which is normally used for real estate sales, contains certain warranties that vary from State to State. Quitclaim deeds are sometimes used for transfers between family members, gifts, or to eliminate clouds on title, or in other special or unusual circumstances.
You can try http://www.realtytrac.com
although i think they're site is outdated. Go to your local town hall and ask where they post all sheriff sales and also check your local paper for any home auctions through the town. Sometimes owners die without wills and no heirs and the property goes intestate and gets escheated by the state in which they sell the property.