Microsoft is now offering a 30 to 50 euro cashback depending on the model! This is done to promote the new low prices for the Xbox360 in the European Union even more.
If you buy a new Xbox 360 Arcade (new low price: 179,99 euro), you'll recieve a 30 euro cashback resulting in a end price of 149,99 euro. A new Premium model with a 60GB HDD attached will set you back 239,99 - 40 = 199,99. Last but not least, the top-end model Xbox 360 Elite with a full 120GB HDD will save you 50 euros for a total of 249,99 euros.
In order to recieve the cashback, you must buy a special Xbox360 box with the special sticker stating it's part of the promotion. After buying the product for the full price, you must apply for a cashback using a form online. Only consoles sold between September 19th and December 31st are valid for this promotion.