Sharepoint for free till 30 users! Just buy a small server with Windows Server 2003 Inside

just send me an email: https://blogs.msdn.com/roberdan/contact.aspx

with some information like number of users and business needs: collaboration, document sharing, marketing typical issue, sales typical issues, public sector typical issues, specific issue.

Sharepoint is embedded on systems with Windows Server 2003, like

http://www1.euro.dell.com/content/products/features.aspx/servers_Q2_W6_pedge_1800_PE618002?c=it&cs=itbsdt1&l=it&s=bsd

(remember to select Windows Server 2003)