If you live in the EU and are considering buying a Nintendo 3DS or 3DS XL, you might want to hold off for a week. Nintendo is offering a promotion where you can download a free copy of Super Mario 3D Land if you register a Nintendo 3DS or Nintendo 3DS XL system on Club Nintendo along with one of 15 eligible games.
The promotion runs between November 27 at 3:01 PM and January 13 at 10:59 PM, all UK dates and times. You could, of course, buy the system earlier, but you'll want to wait to register.
The Nintendo UK site says that after registering your system and game, "log in to Club Nintendo 24 hours later and check the promotional banners for your free download code." The deadline for claiming the download code is 22:59 on February 13th 2014, and you'll need to redeem the code in the Nintendo store by March 13, 2014 at 10:59.