Grab the recently released (and highly recommended) Professor Layton and the Diabolical Box (Nintendo DSi) for $27.99 (7% off) w/ free shipping at Amazon.

Check it out:  Professor Layton and the Diabolical Box

Amazon.com Product Description
When Professor Layton's mentor, Dr. Schrader, turns up dead, it's up to Professor Layton and his apprentice, Luke, to unravel the mystery. The only clue thus far is a train ticket for the Molentary Express. What could it mean, and who — or what — might have caused Dr. Schrader's death? In order to find out, Professor Layton and Luke will embark on an odyssey filled with challenging puzzles which may lead them to an object known as the Elysian Box, rumored to kill all who open it.