Roms make good rewards for positive behavior. . Their jaws dropped when I showed them Majoras Mask on a few days before it released here. They did have to tough it out with the 3DS until la few weeks ago and we don't have an Xbox or PSx. But they did have Acekards for the DSl and I repurposed a 500GB HD a few days after Christmas when we got a Wii years ago. There are still games on there they never even played.Your kids must be the coolest kids in school. I am not sure how many kids have access to stuff like Gateway or Sky3DS or even know about it. I would have gone nuts if my parents gave me a flashcard for my Gameboy instead of buying each game and waiting an eternity for birthdays or Christmas.
They are kind of spoiled, I had to mow a lot of lawns to back in '79 to purchase my Atari. $136 was a lot for kid back then and all we had was a B&W TV.