For Droid App of the Day readers, Mantis Apps is offering a special, Buy1, Get 1 Free promotion on all their paid applications. Simply purchase any Mantis Apps application from Google Play then email the developer and let them know what additional paid application you want. They will then send you the .APK for an easy install - for free!
To keep things simple - put the phrase "Buy 1, Get 1 Free" in the subject of your email. Also make sure you email Mantis Apps using the same address as your Google Play account!