It's actually a seven-way tie for the most expensive Android App on Amazon. Six of the apps are sets of practice flashcards produced by the American Physician Institute. The seventh is a clone of the original Minesweeper game for Windows. For $149.
Now everyone who has ever played Minesweeper knows that it is a great game. But a few bucks more could get you a new Nintendo Wii console, along with a copy of Mario Speedwagon, which is an even better game.