I have one that is in the works right now.
The price range will be around $100.
It collects E-mail, send a confirm E-mail where they can confirm their membership.
It will support multi level memberships, IE: signup free and use parts of the membership. Later they can upgrade to a paid membership to get access to more content, no newsletters or whatever.
I'm thinking about integrating it into TurboThumbs as well so you will be able to see wich of your trades that send you visitors that signup, upgrade to paid or whatever.
It is functional now to collect mails and send out confirm mails, but still need to write a good SMTP mailer to support big mailing lists.
Should be ready in the beginning of January if anyone is interested
