Owners International, or SOI, has "basic free membership" and "lifetime membership" with more benefits, like access to all archives, membership list, etc. That is $55 as I just looked. They may have had a $20 annual once, but I am not sure.
I like both forums, they are different, but both very helpful and interesting and I can tell some people here also frequent SOI, judging by their posts, or because they use the same screen name.
So, hang around, Richard.