Rain Wilds Chronicles
by Robin Hobb
The series seems to be currently discounted at Amazon.
Dragon Keeper (Rain Wilds Chronicles, Vol. 1) is $1.99
http://www.amazon.com/Dragon-Keeper-...kindle+edition
Dragon Haven (Rain Wilds Chronicles, Vol. 2) is $1.99
http://www.amazon.com/Dragon-Haven-R...kindle+edition
City of Dragons: (Volume 3 of the Rain Wilds Chronicles) is $2.24
http://www.amazon.com/City-Dragons-T...kindle+edition
Blood of Dragons (Rain Wilds Chronicles Book 4) is $4.99
http://www.amazon.com/Blood-Dragons-...kindle+edition