I did it before but now i can't find the downgrade link, There was a link to downgrade to the standard free edition if the users are less than 10.
Is there anyway to downgrade or to subscribe directly for free?
I've found the answer here,
unfortunately, As of December 6, 2012, Google no longer offers new accounts for the free edition of Google Apps. Google Apps free edition is sometimes referred to as "Standard Edition." If you already have the free edition, you can continue to use it for free. This change has no impact on existing users of the free edition.