ah, yeah, my mistake. Its hard to find ED (unless you get it online), but its cheap. I was never able to find it in a B&M store, so I accidentely listed as expensive along with Ikaruga because its also hard to find.
I would say now on the subject of hardest to find games a few that come to mind for the DS... and keep in mind I say hardest not impossible since if you know where to look you can still find em...
- Pheonix Wright (soon to be fixed)
- Trama Center
- Electroplankton