Google Play is running a flash sale on the Hunger Games books. I have no idea how long it will last. The books can be read online or downloaded in Adobe DRM ePub (most readers except Kindle).
The Hunger Games $1.99
Catching Fire $5.99
Mockingjay $5.99
Trilogy $18.99
It looks like another series of hers, The Underland Chronicles, may also be on sale.