Here is kobo's list of the 100 books (not a download link though). They should all be puplic domain. Just pick and choose which ones you want. I agree with Dale that the best place to download them from is right here. The books here are usually much better formatted and you can delete them when your done with them. From what I read the way kobo installs them they are very difficult to remove.
If I were you I would actually consider myself lucky not to have to jump through hoops to delete books I'm not interested in.
I wonder if all the Kobo readers at Walmart come without the books preinstalled.
