Two Clicks Mall
Easy to build, always up-to-date, niche-specific, plugins-powered affiliate products store. The biggest catch? It's free.
LockPress
Free WordPress plugin to charge your visitors for accessing blog posts and pages. You will get the payments directly to your PayPal account and you can set the flat or recurring fee items.
WordsPay
Online service to fill your blog with targeted affiliate offers from more than 15 providers, fully customizable and works on auto-pilot. Packages start as low as $7 a month, free accounts available with limitations.