Thanks for the feedback, everyone! I'm reluctant to go to Target, Sears, et al because I feel like those might look cheesy. I want to get a good quality, artistic sort of picture for an author's photo. It's unlikely to appear on the book but it will appear on the press' website, in catalogs, and maybe in advertisements. I don't know yet if the press will pay for it, but I doubt it; some of the other author photos they have are really crappy. But I'm vain, and I hate all pictures of me, and I want a nice photo attached to my book, dammit!

I think I might take luvmylocs's suggestion and try buying a good camera and asking my sister to take pictures of me in some natural light in a park or something. Maybe a really professional picture will look like I'm trying too hard, compared to the other crappy ones used by my publisher.