simply search "cheap wifi android phone"
then install a bitcoin ticker on the phone.. and your done
I don't see why you could not use your phone, ipad, ipod or other similar device. There is no real reason to need a device specifically to display the price of bitcoin. With iDevices you can even change the settings so that the display does not shut off automatically after x amount of time.
With that being said it is kind of unhealthy to be monitoring the price of bitcoin that closely.