The 15.6-inch Asus ZenScreen portable USB monitor is great for adding a second display at home, at work, or for traveling. It just hit a new all-time low price of just $159 at Amazon.
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The 14-inch Asus ZenScreen Ink portable monitor has a 1080p touchscreen display and its own Asus Pen stylus for note-taking and drawing. It's now available at its lowest price of $239 at Amazon.