Just go to any store such as walmart, Best buy, or target and ask someone for help if you cant find one/ I can garuntie you Best buy has them.
you go on the internet and buy one.
you can get it off the internet
action replay hacks games for your ds.
it is the action replay you can buy it for less than 20.00$(at Canada)at future shop and almost every electronics shops
you can buy one at target, bestbuy, and toys r us. Target is the cheapest.