The two models of the DSi are set to take a price plunge in just a few weeks.
http://www.nintendoworldreport.com/news/23935
Nintendo has announced plans to drop the prices of the Nintendo DSi and Nintendo DSi XL systems on September 12. The DSi will fall from $169.99 to $149.99, and the DSi XL will fall from $189.99 to $169.99. The DS Lite will remain at an MSRP of $129.99.
This drop comes as Nintendo plans to unveil the pricing and availability of the upcoming Nintendo 3DS within the next month. No details have been revealed regarding the Nintendo 3DS as of yet, but after the system's launch, Nintendo will have DS systems at five different price points.
The Nintendo DSi XL will still come bundled with several DSiWare games such as Brain Age Express: Math and Flipnote Studio, as well as the Nintendo DSi Browser.