Just remember, the Pi Plate is currently Top Secret (or, as they say in the UK, Most Secret). No price or availability has been announced yet, so, as they say, "It's not out yet, so don't ask". Shhhhhh. For Her Majesty's Eyes Only
Adafruit has the worst-kept secrets in the world - and thank goodness for that!
The best things in life aren't things ... but, a Pi comes pretty darned close!
"Education is not the filling of a pail, but the lighting of a fire." -- W.B. Yeats
In theory, theory & practice are the same - in practice, they aren't!!!