KNOXVILLE, TN (WVLT) - Electronic stores are expanding with gadgets replacing books.

Here are some of the eReaders on the shelves:
-Amazon's Kindle
-Apple's iPad
-Barnes and Noble's Nook

Hardcover book sales are dropping, but sales of these digital books are on the rise. The eBooks can be found at a lesser price. Some classics are even free.

Now that the holiday shopping season is here, they're becoming popular gifts for everyone of all ages.