How much is a sd card for my dsi?

Mini SD card for DSI

• All of the benefits of a standard SD card, but in a much smaller size
• Store digital images, video, MP3 files, and other data in your mobile phone
• 1 GB (1,024 MB) capacity; holds 400 5-megapixel images, 250 songs, or 16+ hours of audio (128 kbps MP3, 4-minute songs)
• Built-in security features let you download, store, and play secure content
• Includes an adapter for use in both SD and miniSD electronic devices
  

The nintendo wesite suggests this.
The Nintendo DSi is compatible with most SD Cards with the following specifications: Memory Capacity: Up to 32 GB (Gigabytes) Type: The Nintendo DSi supports standardSD cards as well as high-capacity SD cards (SDHC) up to 32 GB in size.This includes miniSD and microSD when used with their respectiveadapters Speed: SD Cards with a slow speed mayexperience slow transfer time when loading files, or may not work atall. Slow transfer times can also occur with SD Cards that have a greatnumber of files on them.

You have a nice little gadget there.  I always like the Nintendo's because my favorite game is on there; Super Mario Bros.  Moving on to the sd for you Nintendo DSI, they are economically priced.  You can find one that will run you about $14.99 with 2 gb of memory.  Try checking out http://www.barnesandnobles.com you might also want to check out your local gamestop store http://www.gamestop.com.  Have fun playing!

 well you dont need a specific  sd card for a dsi just any kind of sd but here's a pack of two sd cards that are both 2gb for 12 bucks ar walmart link :http://www.walmart.com/catalog/product.do :) good luck hope i helped1