Catching Fire by Suzanne Collins still in hardcover. Why?

I'm a late comer to the Hunger Games trilogy. I resisted reading it because it was so popular; I couldn't believe anything was that good. I'm a bit of a reading rebel at times. I'm not ashamed to admit I was wrong--terribly. I finally succumbed to the pressure and bought it. It is awesome! I'm on to book two and I find it very strange that Catching Fire is still out in hardcover. It released in 2009 and the last book of the trilogy, Mockingjay is out. Why isn't Catching Fire out in paperback yet? Even the first book, Hunger Games is out in paperback form. I've never noticed this in a series before. Catching Fire will be two years old in September. What's the holdup? I've downloaded the kindle edition, but still like to have a physical book in my hands, especially of my favorite reads. I buy a lot of books and I depend on the paperback to save money. What about you? Does anyone have any ideas about what's the deal with this hardcover/paperback situation? If you do, fill me in. I'm curious.