Have been watching this for a while, it's supposed to be an excellent ever changing story based board game where what you do alters the actual board and your character as you go. It is also the number one rated game over at boardgamegeek.com so it must do something right. Had to bite at this price.
This is the cheapest I've seen it for and, according to camelcamelcamel, the cheapest it has ever been on Amazon. It is the price for the blue box version only, but the contents are the same in both so you are not missing anything whichever colour you pick up. Cut and paste description follows:
The world is on the brink of disaster. In Pandemic Legacy, your disease-fighting team must keep four deadly diseases at bay for a whole year. Each month will bring surprises and your actions in each game will have repercussions on the next. Will you let cities fall to the diseases? Will your team be enough to keep the viruses at bay for a whole year? Craft your own unique Pandemic experience with Pandemic Legacy.