It's a mouse. It's $15. It's not really geeky, but I guess Linux fanatics might want to gift it to their kids. Stats below.

Interface: USB
Mouse Structure: Optical
Resolution: 800dpi
2-button mouse with scroll wheel.
Ergonomic design, comfortable control.
Latest optical tracking engine for pinpoint accuracy.
Optical sensor stays precise on the most surface without mouse pad
Support Windows XP, ME, 2000, 98SE or Mac OS.
Dimension: 9.2 x 8.0 x 3.0cm
Weight: 66g
Cable length: 140cm
Color: Black, Pink, Blue


Cost is $15. [USB Geek]