Thought I'd update this to mention, I just ordered an item called "The Pouch" from this website:
http://www.thepouch.com/ebookwise-1150.html
I couldn't tell from the description if it had a strap so I emailed, and got a quick and friendly response from Robert Luningham, who told me to just request the strap when I ordered. I did so and am looking forward to receiving my pouch in a few days! Will let you know if it works out for me. :-)