I worked for a company named ELAN GMK several years ago.
We provided this service.
There is a lot you might nee to know before you scan of course, we liked to use this long scary form to help people understand that the price is quite dependent on what we are given, the time frame and what they need the scanned archive to do.
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General Business — ELAN GMK
We used ELAN Capture (our own software) and I have use ABBYY fine reader.
We had a truck to pick up rooms of documents - we normally had to prepare the files for scanning (removing staples and such), adding barcode separator sheets (which helped us organize and add chapters / sections to the data file / pdf export) then scanning, then processing, OCRing and indexing as well burning the DVDS and returning the files into the same order they were.
This was sometime done on site (when the documents were in a secure environment)
see this link -->
Michael Jahn's blog
there is a slide show at this blog post that describes the process...
it was more typical that we charged 25 - 35 cents per page (duplexed)
in some projects, it was higher, but very few were lower.
The PDF files need to be Beats stamped, BTW.
There is a nice blog for the 'roll you own' folks here;
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Acrobat for Legal Professionals
This is not for amateurs. I have used
ARCHIVE IT! Box Storage, E-Docs Solutions, Document Destruction - ArchiveIt.com in Southern California and would highly recommend them, ask for Guy Puckett