How to Get It:
You've got to run the new Icecrown Citadel 5-man instances, also known as the Frozen Halls. This one is actually in the Pit of Saron, which is the second instance that you'll do in order (we've got a full attunement guide
up already). But all of the instances are definitely worth doing, and with the Dungeon Finder in effect, you've got no excuses. Run through them this weekend, when you get to Forgemaster Garfrost in PoS (yes, that is the abbreviation), hope this drops, win the roll against your other-realm PuGgies, and the staff is all yours. Good luck!
Getting Rid of It:
Sells back to vendors for 27g 43s 88c, and disenchants into an Abyss Crystal or two. And if you do go raiding, you will be replacing it sooner rather than later.