Friend,
I gave you the direct link to the software in the previous post, its hosted at sourceforge( the mother of free or OSS softwares). You can go to the link and learn about it there.
Oh and BTW please check the project first so that it meets your needs. I saw this information on the above link. Hope fully this is what you are looking for.
Smart ERP+CRM solution for Small-Medium Enterprises in the global market covering all areas from order and customer/supplier management, supply chain to accounting.
Here is the direct link, you can find the email or contact information on this page.
http://www.compiere.org/
It under mozilla liscense, and that makes it Opensource. So I dont think you will need to spend money on it. Un less other wise you hire the company services which if they offer.