OverDrive posted a correction on their(first spotted by DBW). It seems they goofed on their math. It' turns out that prices will be 2.2 times current prices, not that they will be 2.2 times more than current prices. So the prices are doubling, not tripling.
Here's the updated note:
*Editor’s Note: In our initial email to library partners announcing the Hachette price increase, we made an error in calculating the percentage of the increase. On average, the cost of Hachette eBooks for libraries will increase by 104 percent, or 2.04 times the current price.
Curiously enough, OD didn't make any effort to spread this information around. I could almost think that they let the incorrect info circulate as a way of turning the public against Hachette, if not for the fact I don't think they're that Machiavellian. In any case, Hachette still hates libraries.
image by thejester100