JL, good points...although you can't buy just anywhere unless you are willing to strip the DRM. There are definitely MORE sites than I imagined--some I hadn't heard of, some I had, but since I don't shop there myself...well, I forgot about them.
You're very right. My own shopping habits (I shop at two of the stores...with only a very occasional wander to a different one or to an author's website) are telling in the poll.
At first I was very annoyed that I didn't allow people to select more that one place. But in the end...it's probably better because it forced people to select their number one place (or ignore me entirely!)
At first glance it seems to me that as a writer I need to figure out how to get my books onto Baen...
Failing that, I'm finding that it's more important than I guessed to be in the Sony shop and Kobobooks. Most of us authors have no sales data from these points and won't for 3 to 6 months (the reporting is quarterly and then delayed another month for compilation.)
I'm also completely guessing, but it seems that experience e-readers might find they have to strip DRM to get the selection and pricing they want/expect/deserve.
Keep the votes coming. Y'all are very helpful and I appreciate your time.
Maria