They sell that on Gamestop. But its with that and theres a charger. But the charger sucks and can damage your battery life on your NDSL

 

I had something like that for my GBA

 

I had something like this for the gba SP that I won from a shonen jump competition. It was pretty cool: it added handles like that, and it also had this thing you put on the front and it was a control stick that applied pressure to the buttons when you moved it, so it was like a simple Gamecube controller for GBA lol.