This has been as low as $9.99 15 months ago so figured this is a good price if you are want to own the trilogy. Here is the description from Amazon website.
From the Manufacturer
As Commander Shepard, rise to become the galaxy’s most elite soldier and lead an all-out war to stop an ancient and ruthless enemy: the Reapers. With over 75 hours of content and more than 300 awards, one of gaming’s most acclaimed franchises is available for the first time in a premium foiled box set.
Heart-pounding action meets gripping interactive storytelling where you decide how your unique story unfolds. Assemble and lead your team aboard the SSV Normandy, the most advanced ship in the galaxy, and travel to distant and unexplored star systems. On your journey, meet a cast of intriguing characters each with their own story to tell. Wield powerful weapons and customize them with upgrades to create new and devastating attacks. All the thrilling action and your decisions culminate into a heroic battle against the greatest threat ever known.
The fate of the galaxy lies in your hands-how will you chose to fight for it?
On PC, Mass Effect will include Bring Down the Sky and Pinnacle Station. For Mass Effect 2, Cerberus Network will be included which features Zaeed – The Price of Revenge, The Firewalker Pack, Cerberus Assault Gear, Arc Projector heavy weapon, and Normandy Crash site mission. For Mass Effect 3, Online Pass will be included granting players access to co-op multiplayer.