For those wanting something a little more exclusive, I suppose I could always find a small engineering firm to machine a case out solid aluminium/aluminum, anodise and laser etch it - then charge $1000.00 per unit, though I'm not sure I'd shift all that many.

Joking apart, at $39.00 I'd be more than happy to buy one - even if only just to try it. What I found more amazing is that it's the only device of its type I could find.