How many reprographics companies are there in the U.S.?

Someone asked me this question the other day, and, other than a ball-park estimate of somewhere between 500 - 700, I really had (and have) no clue.

Many years ago, when we were in the process of taking our company public, one of our securities attorneys, who, at the time, was trying to write our prospectus, asked me that question.  And, back then, we came up with a ball-park guess of 2,000 reprographics companies.  But, that was 1985, well before ARC and Thomas completed a bunch of acquisitions and well before the "Great" Recession (the latter did force some companies to close their doors.)

Anyone out there know - or willing to venture a guess at - approximately how many reprographics companies are operating in the U.S.?