Used/Cheap Components

>     I am hoping that someone can help me find a trust worthy Computer
> store that I can buy inexpensive (when I say inexpensive, remember
> that I am a recruiter) computer components.  I am taking on a project
> to complete three computers that I recently acquired.  I need the
> basics, CD-ROM's, 3 1/2 floppies, memory, and some other little
> things.  Can anyone recommend a place that I could go to and look at
> these things.