Sony has cut the price of its Reader Wi-Fi e-book reader by $30 until December 24. At $99, the Sony is now the same price as the top-selling e-book readers with touch screens, the Barnes & Noble Nook Simple Touch and Amazon Kindle Touch.

The Sony is a recommended model in our Ratings of e-book readers, although it ranks a little below its Nook and Kindle competitors in overall performance. However, it weighs a little less than they do and is the only reader on the market that allows you to borrow library e-books entirely wirelessly.

Got an old e-book reader kicking around the house that you no longer use? Until December 31, Sony is offering a further $50 off one of their readers if you trade in an old model of any brand.

For help in choosing a model that's right for you, see Consumer Reports' buying guide on e-book readers.