Very much depends on condition. Is it covered in oily prints and has torn pages. Or as new?
There are quite a few PDFs' etc knocking about so many wont bother buying, that said by the time you print out an entire manual from PDF you can run up a big bill even on a laser (unless its works of course).
I agree, ebay will be the judge. You can allways see if there are ay for sale and watch the auction.