Way back when I bought my first membership, I think it was $15. I think it was within a week of me finding the site. I got so much information so fast, and thought it was cheaper than the money I spent on even one book.
This was the first (and only) site I've ever paid. I went from extract brewing to all-grain with a pretty decent knowledge of brewing science just from this forum. Of course, that started my downward slide into kegging, and now wanting to create a brew sculpture. It's created a monster!