I have 2 NDS lite's left from when I used to repair them.
I cant remember what's up with one of them, but I know the other switches one and works fine apart from the lower screen is blurry and the hinges on case are damaged.
Prob possible to make one good one from the two.
They sell on ebay in this condition for around £20 - £30 each.
£30 ono for the two of them.
I'll throw in an R4 if they go for the asking price.