This is almost a secret; the official announcement is not out yet, but the beta testing has begun. The American Humanist Association, the nation's largest and oldest group for nontheists, is creating a new, free, online-only membership opportunity.
Go to the AHA site:
American Humanist Association
In the orange area of the banner at the top of the page, click "New! FREE Online Membership." Registration is not limited to US citizens. There is an area for "Referred by," you can list me by name, Janice Rael. This will create your registration.
Some of the features for the AHA's free online membership are not yet up and running, but since they are accepting registrations now, jump in!
I'm a regular, dues-paying member of AHA, and I love their magazine,
The Humanist.
When I get more details about the benefits of the free online AHA membership, I'll let you know. The official announcement should be out soon.