I went with $3.99 for my starting price. I came up with that by considering word counts and by asking a few fans what they'd pay for an e-book. (They actually gave higher numbers.)
Why word counts? I write short stories, too. If I'm going to sell a 4k word short story for $0.99 US, I don't want to sell a 80k word novel for $1.99.
I also considered what I'd be charging for a PoD. I'm currently tweaking book layout and such to try to be able to offer a print version at mass market pricing. I don't feel comfortable charging $4.99 for an e-book when I want to sell print books for $7.99, if possible.
For the month of June, I'm trying a $2.99 price point. So far, sales have actually dropped. Once I have more books done in this series, I may try a more dramatic sale of the first book, because I've seen other authors report that it helps sales for succeeding books, but I've not decided yet.
Genre: YA fantasy