Article Script that allows selling articles?

[jeeplaw]

Anyone know of a script (free/paid) that allows the webmaster to sell via paypal (or other gateways) articles on a site? I'm looking for one that will do that and allow for an intro paragraph to be shown, and on purchase, the full article.

[JSource]

Constant Content (http://www.constant-content.com) has a system that does this. You can purchase and sell your unique articles, but they take a cut I think its 25%.

Really it just looks like you could use any shopping cart type script to do this.