We have 2 DS and 2 DS lite. I asked, and neither of the kids with the DS were willing to part with theirs
Sometimes Gamestop.com has them
http://www.gamestop.com/default.asp?sect=1267
(they don't have one listed today)
We have a Gamestop store in town, I'll give them a call tomorrow and see if they have one (used) and if they do, I'll ask the price.
Susan