The phrase "than hardcovers" is a comparison used to indicate that something is more preferable or easier than using traditional bound books, often referred to as hardcover books.
Sentences with «than hardcovers»
This has been attributed to an increase in the cost of ebooks which in some case costs even more than the hardcover version of the same. (goodereader.com)
A small paperback novel with no interior color will cost less than a hardcover book with a full - color interior and a dust jacket. (millcitypress.net)