I also wanted something that would allow me to hold my Nook with one hand without a death grip. This was especially needed for crowded train commutes when I needed one hand to hold a rail.
So I used what was at home--no slip grip flat hair bands. Place one top, one on bottom and looped three together to make a vertical bar. All this looks an "I". Take that "I", loop the top and bottom of it to the top and bottom of the e-reader. I usually use the vertical bar to hold the reader but can change it up by also slipping my hands through the bottom of the "I".
http://imgur.com/TmWz4oyhttp://imgur.com/RedJHW3http://imgur.com/pJlOFfMI would post photos but the images are enormous. How do they make them small? In any case, use the links for photos.
I bought the hair bands from CVS so they're pretty easy to find.