As one of its daily deals, the Amazon Appstore for Android offers downloads of Trainyard for Android
. That's $1 under the lowest total price we could find for this puzzle game. Deal ends November 13 at 2:59 am ET.
If you haven't claimed it yet, you can receive a $1 Amazon MP3 Credit for free with this download. (It can only be claimed once per Amazon account until December 31.)