There are many thousands of worthy apps in Google Play, but not all of them are on sale. If you're going to spend money, you might as well do it when there's a sale on, right? Better jump on these before they're gone.
RAM Manager Pro (root) – $1.04 from $3.18
Daily Workouts – $2.99 from 3.99
Robotic Guitarist – $1.49 from $3.20
Choplifter HD – $2.99 from $4.99
Starship Battles – $0.99 from $1.99
Asphalt 8: Free from $0.99 (now free forever with in-app purchases)