How much willit cost for a screen?

Anywhere from $25-$82 on Amazon From here http://www.photostudiosupplies.com/chromakey-green-screen.php you can get green screen only from $16.95

1000

A computer touch screen will cost anywhere from USD $150 on up depending on the size and features.

ok so u can make your own but it has to be green or blue but they have to be true green/ or blue ( so no lime green, baby blue ect) or you can purchase them online which depends on how much you want...

im sorry i dont have anything very useful to say. if i were you, i would just buy a new DS