NPR piece: Questions For Hugh Howey, Author Of 'WOOL'
Wool - Part One is a free download on Amazon.
Disclaimer: The free first segment of Wool leaves you at a cliffhanger that makes you want to keep reading. The entire multi-part story is available for $5.99. See - Wool Omnibus Edition (Wool 1 - 5) (Silo Saga)
You can buy part 2 for .99 if you want to try one part after the free part without investing the full $5.99.