This LISEN tablet mount is $5 off the regular price at Amazon. It fits a wide range of devices from 4.7″ to 11″, including most iPads, Galaxy tablets, and e-readers, and attaches to headrest posts spaced 0.4″ to 7.1″ apart. The arm adjusts along three axes and holds up to 20 lb., making it suited for backseat use with children. Prime members get free shipping.  Buy Now at Amazon