The popular RSS news reader Unread for the iPad recently relaunched as a free download, however, users can only read their for first 50 articles for free before it changes to a 3 article per day limit. Of course you can unlock the unlimited version for $3.99 as an in-app purchase. This is exactly why Apple changed the "Free" button on the App Store to a "Get" button, but it is still a good deal if you want to give the app a spin before purchasing.
The pay version of the app includes unlimited reads, more themes, plus all the features found on the free version such as full-screen reading and background refresh. Other features include the ability to change the read/unread status of an article with a simple double tap and a persistent web browser that keeps track of your history.