If you are searching a Subscription Component in Joomla, then your search ends here. And it's free and comes with a documentation, I've never seen before. It's just perfect.
I recommend this product, like all extensions coming from Nicholas! He is just a genius.
I had a little issue and the support answered and fixed it in less then 12 hours!
Sometimes you can't even expect this from a commercial extension! And this one is FREE!