For only a limited amount of time you can get 1,000 free DSi Points when you buy any NEW DSi at any retailer. You can save them for any game in the future that you want if it is not already available on the Nintendo DSi store.
Listed Time for Offer Confirmed by Nintendo:
April 5th 2009 - October 5th 2009
Wireless Broadband Connection is Required for the Nintendo DSi store.