Borders tends to carry Ellora's Cave but I find the best selection to be from the publishers themselves. I seem to have a hard time finding the authors I love in the store!
However, the truth is, I am spoiled! If you only knew how many ebooks I get for free! And that is not always a great thing b/c the authors want feed back and it is hard to say "This Sucks" in a polite manner :) And I really don't like getting them for free so I will go and buy the print version!
This is probably much more than you wanted to know!
Oh also check out the sales section of the pubs website! Some times you can find great deals.
And then of course I have to plug my newsletter!
Genesis Sun Our authors have some great contests and there are almost always books up for grabs! Some of the women from this board have already won some!
Also, if you want a pretty complete list of epublishers email me and I will send you the word document!