Where is the best place to buy a slightly used vehicle?

I would like to buy a Toyota Corolla or Mazda 3 with 50,000 miles or so, cash. Is it better to buy it from a dealer or a private party?
I live in Milford, CT and looking for a Toyota Corolla or Mazda 3 with about 50,000 miles.

No such thing as slightly used or gently used.... it's either new or used.

Search http://www.autotrader.com

Always run a Carfax report and have a mobile mechanic thoroughly check it out.

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