$2 is highway robbery and I once had to stop at a Walgreens for an emergency session with a Chargepoint - all of the Walgreens are charging $2/hour for their Chargepoints, grrr...
You can sign up for Blink Plus for free through the end of 2013 and get the reduced $1/hour rate. That's at least something.
Blink chargers seem to all charge a fee around here, but at least 50% of Chargepoints are free. I haven't stopped at a Chargepoint at a company (i.e for their employees), but I did use a free one at a hotel and stopped into the lobby to make sure they were OK with it. The evening clerk was psyched that the chargers were being used and very curious about the bike so it was cool. I once had to use one that charged per kwh and it was about as bad as the $2/hour, but it was near where I wanted to stop. If I was planning a trip I'd hunt more for free ones and just amuse myself wherever the free ones were.
The Chargepoint Android app allows you to filter on free chargers, but I didn't find a way to do that on the web site.
Another site/app to use is Plugshare. It lets you search multiple networks and even privately owned charging stations if you sign in. Not sure how the negotiation goes to use a privately owned charger, though - I'm too shy to try that...