This plugin will help you  get content on your wordpress blog  where normal themes dont allow you to put content. You can have a rss widget in your post or page.

Widget Anywhere plugin will provide you a GUI to insert any WordPress widget in your page or content of  post.

widgets-anywhere

After installation, a tiny mice button will appear either in the post or in the  page of editor. By clicking on that button you can launch tiny mice popup with the  list of all available widget.

This plugin is available from http://wpeden.com/product/widget-anywhere/ for $13

GET THIS WIDGET DOWNLOAD  HERE