Look for places that sell cameras, or possibly phones. Specialist stores should have them, but supermarkets might sell them more cheaply.
Yes, the DSi (and XL) use the same memory cards as the Wii does.
http://www.bestbuy.com/site/SanDisk++8GB+SDHC+Memory+Card+for+Nintendo+DSi/9317303.pid=1218084030882&skuId=9317303&st=dsi&cp=2&lp=1 or... http://www.bestbuy.com/site/SanDisk++4GB+SDHC+Memory+Card+for+Nintendo+DSi/9317296.pid=1218084033076&skuId=9317296&st=dsi&cp=1&lp=15 They are the official SD cards of the Nintendo DSi.
nintendo ds: no nintendo dsi: yes(but needs acompatible memory card)
No, you do not.
u put it in your ds(i) and u can store thing in it
No, but it helps if you want to store a lot of media because the DSi only has a limited amount of space. But music can ONLY be stored it on a SD card and NOT the DSi's memory.
NO, a PSP's memory stick is a memory stick pro duo. A dsi's is a sanDisk
Unfortunately no. You can only put music on a Nintendo DSi and N3DS with a SanDisk.
Cartridge-based games will save to the cartridge. A memory card is necessary only if you download DSi-ware games from the shop.
No, only the DSi has an SD card slot.
It doesn't come with one, but it has aq slot for SD memory cards
The Nintendo DSi supports SD and SDHC Memory cards, and it should also support MMC, but I'm not 100% sure.