The LEGO Harry Potter: Years 1-4 games for Nintendo DS, XBox and PS3 are all deeply discounted at Amazon today! The game for the Nintendo DS is 50% off, so it's only $14.99
The LEGO Harry Potter games for XBox and PS3 are both $29.99, which is 40% off the list price of $49.99! Just look for the game system logo under the price and click on it to see the price for that specific console.
Shipping is free with Amazon Prime or it's free if you spend $25 or more.