Amazon Appstore offers downloads of Terraria for Android for $1.99. (Google Play charges the same.) That's $3 off and the best price we could find for this sandbox adventure game. (For further comparison, iTunes is currently charging $3 more.)
Amazon offers a selection of Cartoon Network apps for Android for 99 cents each. That puts each app to $3 under what Google Play charges. Choose from apps based on Adventure Time, Powerpuff Girls, Ben 10, and more.