WPSales Engine
This is a plugin that every sales person should have.
It creates sales pages, opt-in pages, disclaimers and all legal pages for your wordpress site as easy as a few clicks.
You really shouldn’t be without WPSales Engine if you take making sales pages seriously … this makes life so easy and saves a lot of hours which you could use for making more money.
Read more here : WP Sales Engine
Or visit their site at : WordPress Sales Engine