You have to spend a certain amount of money with Best Buy over a time period (I believe it is one year). I think the magic number money wise is 2000 or 2500 dollars.
In for 1. It's available on the website. Had a gift card with 70 bucks left so I ended up paying $150 (with tax) for a 27" monitor that's a decent brand. Had to do it. =D
I snagged one as well after having the $100 sony monitor removed from my cart when I tried to pay for it. Seems like a decent deal since it sells for $340 on newegg.