I never did get to see it, but a friend of mine clames to have seen a Honda FCX last weekend in wisconsin as he was wondering around in the parking lot at the Midwest Renewable Energy and Sustainable Living Fair, so not only are there something like 13 of these in the US, but people are useing them!
If these Honda FCXs were mass produced, you'd be looking at about $500,000 today, the most pessimistic estimates being $1 million, the most optimistic estimates being $120,000.