the same like that http://www.edu-doc.com/ or that http://www.toodoc.com/ or that http://www.aeropdf.com/
Would you mind disclosing how much you would like to charge for your scripts? Can we see them in action somewhere? Are they customizable? Can I use them to search for a particular kind of document or file extension within a particular website, especially one that is protected by login?
good set of questions.. i wanted to ask them myself but wasnt motivated enough seeing the op did not post anything other than telling us its " expensive " .. which btw is a very relative term.. 100 $ might be expensive for some and peanuts for some.
Well it only searches the results from Google. the site iw as running the script on is closed sometime back. But for any search you make you get the results i will install a demo soon and will post it here.
i have uploaded the one which search the doc files from all over the internet with download link. http://php-scripts.info/docsearch let me know if this is what you were looking.
This thread may help those looking for a decent PDF Search engine, plus more features: http://forums.digitalpoint.com/showthread.php?t=1585788
I can offer you script implemented in this PDF search engine! Also, do you have any other special requirements? Cheers!