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However you get the scans - 1dollarscan, bookscan, your own scanner - it requires serious work to edit out all the various OCR errors (which, in nature and quantity, depend on font, print and paper quality, layout etc. as much as on scan quality). For a blind reader who listens to a voice synthesizer, some OCR errors can be more distracting and difficult to deal with than for a sighted reader, who, from the visual appearance of the misspelled word, can more easily guess its true meaning (the and die, comer and corner, etc. etc.), or can more easily skip it.
Of course, in most cases a blind reader will prefer a file with OCR errors to not having the book at all, but if you want to keep the number of errors reasonably low, you'll probably have to proofread. (And, in the process, you'll sometimes discover errors that have already been in the printed book ...)
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