The full novel "Metro 2033," translated from Russian to English, is free as a Kindle E-book on Amazon.
Here is a link: http://www.amazon.com/dp/B008W9ANW6
The deal may expire in three hours. Hurry! Still alive!
Edit: Make sure you see "Kindle Price: $0.00" on the page. Click the "Buy now with 1-Click" once you have confirmed this.
Do not click the "read and listen free button"!
10/23 Edit: By purchasing the Kindle edition of "Metro 2033," Audible allows you to purchase the audiobook version for $1.99 plus tax. You should see: "Whispersync for Voice Price:$1.99."
Final Edit: Died in 27 hours at 12 AM PST, 10/24/15.