Originally shared by Mathias Dietz
The german retailer “Real” offers the Samsung Galaxy Tab 3 (7") for just 79€. Together with the gcodeprintr App you can build a cheap touch screen control panel for your 3D printer.
http://onlineshop.real.de/Tablet-PC-17-8-cm-7-Zoll-2-x-1-2-GHz-Dual-Core-Prozessor-Galaxy-Tab-3-7.0-Lite-Wi-Fi/0309861001001
GCodePrintr works very well with the GalaxyTab, the only disadvantage: the galaxy tab does not have a separate charging port, you have to charge it before you start a longer print.