if not dealextreme, then try Red of stuff or gameyeeah
Beware its says on dealextremes site 3in1 works on DS/DSlite but its a lie, I even emailed them and they said it would working in a old style phat DS, but the ones they sell don't they even had 2 bad comments from customers complaining (I even stated that in my email) There is a different version that works in the old DS's. Make sure you get the one you need.