New portable by clockworkpi. There's different versions available, 4G optional for 40$. I don't like L/R on the front (Edit: it just dawned on me those might be mouse buttons, which is fine. But still missing L/R on the back then), the d-pad doesn't look very usable and enter/backspace should be swapped. Neat little trackball though and quite powerful with that compute module. Price with 4G and shipping is 300$.