What type of equipment do most DJs use?

I was wondering what the most commonly used types of equipment are used as far as trance and club DJs, in their live and studio endeavors. If you know any of the equipment, brands, and a cheap place to purchase that stuff i would be enormously appreciative if you could post a link.
"> I would try craigslist for used DJ equipment.
or

http://www.guitarcenter.com/DJ-Gear-Pro-…

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