Just had a look at the site... looks like the mark 4 is what we are waiting for...
"Science Tricorder Mark 4
Active Development period: Current (beginning Spring 2011)
An experiment in further dramatically reducing the cost of a Tricorder without sacrificing visualization capabilities. My hope is that this may be an initial model that could be mass produced, and that folks could have in their hands.
Fabbed in November 2011, and currently undergoing software development."
How long will it be until this is on the market?
*Wants one implanted in arm* (a teeny one obviously)
"We knew he was someone who had a tragic flaw, that's where his greatness came from"