This is a nice simple case for the SmartLCD display with 6-7mm knob post, built-in chirp speaker, and SD card slot on the left side. The SmartLCD comes with many RAMPS kits, including one from Gadgets3D, which is where I got mine as part of their full RAMPS 1.4 kit.

Two optional 3mm screws can hold the SmartLCD in place inside the case, or just insert the LCD into the top part first before adding the bottom part. The top and bottom are designed to fit together so no additional hardware is required.