Looking for a WHMCS install I can use

Hi,

I want to start using WHMCS as a business administration tool for my domains and vps's I rent. So basicaly billing and renewals.
Is there anybody with a cheap license I can use?
A small VPS ( 128/256 MB) with a licensed WHMS is what I am looking for. I do not need to control servers or anything, I just need cron and a license.